Add global usings (#668)

* Use global usings

* Fix namespace declarations for test projects

src/Spectre.Console/Widgets/Calendar.cs

@@ -1,9 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Globalization;
-using System.Linq;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/Canvas.cs

@@ -1,7 +1,3 @@
-using System;
-using System.Collections.Generic;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/Charts/BarChart.cs

@@ -1,9 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Globalization;
-using System.Linq;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/Charts/BarChartItem.cs

@@ -1,5 +1,3 @@
-using System;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/Charts/BreakdownBar.cs

@@ -1,8 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 internal sealed class BreakdownBar : Renderable

src/Spectre.Console/Widgets/Charts/BreakdownChart.cs

@@ -1,8 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Globalization;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/Charts/BreakdownChartItem.cs

@@ -1,5 +1,3 @@
-using System;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/Charts/BreakdownTags.cs

@@ -1,8 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Globalization;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 internal sealed class BreakdownTags : Renderable

src/Spectre.Console/Widgets/CircularTreeException.cs

@@ -1,5 +1,3 @@
-using System;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/Columns.cs

@@ -1,8 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/ControlCode.cs

@@ -1,6 +1,3 @@
-using System.Collections.Generic;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 internal sealed class ControlCode : Renderable

src/Spectre.Console/Widgets/Exceptions/ExceptionConverter.cs

@@ -1,10 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Diagnostics;
-using System.Linq;
-using System.Reflection;
-using System.Text;
-
 namespace Spectre.Console;
 
 internal static class ExceptionConverter

src/Spectre.Console/Widgets/Exceptions/ExceptionFormat.cs

@@ -1,5 +1,3 @@
-using System;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/Exceptions/ExceptionFormatter.cs

@@ -1,8 +1,3 @@
-using System;
-using System.Linq;
-using System.Text;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 internal static class ExceptionFormatter

src/Spectre.Console/Widgets/Exceptions/ExceptionInfo.cs

@@ -1,5 +1,3 @@
-using System.Collections.Generic;
-
 namespace Spectre.Console;
 
 internal sealed class ExceptionInfo

src/Spectre.Console/Widgets/Exceptions/StackFrameInfo.cs

@@ -1,8 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Diagnostics.CodeAnalysis;
-using System.Net;
-
 namespace Spectre.Console;
 
 internal sealed class StackFrameInfo

src/Spectre.Console/Widgets/Figlet/FigletCharacter.cs

@@ -1,7 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-
 namespace Spectre.Console;
 
 internal sealed class FigletCharacter

src/Spectre.Console/Widgets/Figlet/FigletFont.cs

@@ -1,7 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.IO;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/Figlet/FigletFontParser.cs

@@ -1,8 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Globalization;
-using System.Linq;
-
 namespace Spectre.Console;
 
 internal static class FigletFontParser

src/Spectre.Console/Widgets/Figlet/FigletText.cs

@@ -1,8 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/Grid.cs

@@ -1,8 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/GridColumn.cs

@@ -1,6 +1,3 @@
-using System;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/GridRow.cs

@@ -1,8 +1,3 @@
-using System;
-using System.Collections;
-using System.Collections.Generic;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/Markup.cs

@@ -1,8 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Diagnostics.CodeAnalysis;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/Padder.cs

@@ -1,6 +1,3 @@
-using System.Collections.Generic;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/Panel.cs

@@ -1,8 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/PanelHeader.cs

@@ -1,6 +1,3 @@
-using System;
-using System.ComponentModel;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/Paragraph.cs

@@ -1,9 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Diagnostics;
-using System.Linq;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/ProgressBar.cs

@@ -1,9 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Globalization;
-using System.Linq;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 internal sealed class ProgressBar : Renderable, IHasCulture

src/Spectre.Console/Widgets/Rows.cs

@@ -1,8 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/Rule.cs

@@ -1,8 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/Table/Table.cs

@@ -1,8 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/Table/TableAccessor.cs

@@ -1,7 +1,3 @@
-using System;
-using System.Collections.Generic;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 internal abstract class TableAccessor

src/Spectre.Console/Widgets/Table/TableColumn.cs

@@ -1,6 +1,3 @@
-using System;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/Table/TableMeasurer.cs

@@ -1,8 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 internal sealed class TableMeasurer : TableAccessor

src/Spectre.Console/Widgets/Table/TableRenderer.cs

@@ -1,8 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 internal static class TableRenderer

src/Spectre.Console/Widgets/Table/TableRendererContext.cs

@@ -1,8 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 internal sealed class TableRendererContext : TableAccessor

src/Spectre.Console/Widgets/Table/TableRow.cs

@@ -1,8 +1,3 @@
-using System;
-using System.Collections;
-using System.Collections.Generic;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/Table/TableRowCollection.cs

@@ -1,9 +1,3 @@
-using System;
-using System.Collections;
-using System.Collections.Generic;
-using System.Linq;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/Table/TableRowEnumerator.cs

@@ -1,7 +1,3 @@
-using System;
-using System.Collections;
-using System.Collections.Generic;
-
 namespace Spectre.Console;
 
 internal sealed class TableRowEnumerator : IEnumerator<TableRow>

src/Spectre.Console/Widgets/Table/TableTitle.cs

@@ -1,5 +1,3 @@
-using System;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/Text.cs

@@ -1,9 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Diagnostics;
-using System.Diagnostics.CodeAnalysis;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/Tree.cs

@@ -1,7 +1,3 @@
-using System.Collections.Generic;
-using System.Linq;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 /// <summary>

src/Spectre.Console/Widgets/TreeNode.cs

@@ -1,6 +1,3 @@
-using System.Collections.Generic;
-using Spectre.Console.Rendering;
-
 namespace Spectre.Console;
 
 /// <summary>