Add Spectre.Cli to Spectre.Console

* Renames Spectre.Cli to Spectre.Console.Cli.
* Now uses Verify with Spectre.Console.Cli tests.
* Removes some duplicate definitions.

Closes #168

examples/Console/Info/Program.cs

@@ -0,0 +1,29 @@
+using Spectre.Console;
+
+namespace InfoExample
+{
+    public static class Program
+    {
+        public static void Main()
+        {
+            var grid = new Grid()
+                .AddColumn(new GridColumn().NoWrap().PadRight(4))
+                .AddColumn()
+                .AddRow("[b]Color system[/]", $"{AnsiConsole.Capabilities.ColorSystem}")
+                .AddRow("[b]Supports ansi?[/]", $"{YesNo(AnsiConsole.Capabilities.SupportsAnsi)}")
+                .AddRow("[b]Legacy console?[/]", $"{YesNo(AnsiConsole.Capabilities.LegacyConsole)}")
+                .AddRow("[b]Interactive?[/]", $"{YesNo(AnsiConsole.Capabilities.SupportsInteraction)}")
+                .AddRow("[b]Buffer width[/]", $"{AnsiConsole.Console.Width}")
+                .AddRow("[b]Buffer height[/]", $"{AnsiConsole.Console.Height}");
+
+            AnsiConsole.Render(
+                new Panel(grid)
+                    .Header("Information"));
+        }
+
+        private static string YesNo(bool value)
+        {
+            return value ? "Yes" : "No";
+        }
+    }
+}