Moved analyzer tests to its own project

Also moves tests to `./test` which makes it possible
for all test projects to share the same .editorconfig
files and similar.

test/Spectre.Console.Tests/Data/Commands/DumpRemainingCommand.cs

@@ -0,0 +1,39 @@
+using System.Diagnostics.CodeAnalysis;
+using System.Linq;
+using Spectre.Console.Cli;
+
+namespace Spectre.Console.Tests.Data
+{
+    public sealed class DumpRemainingCommand : Command<EmptyCommandSettings>
+    {
+        private readonly IAnsiConsole _console;
+
+        public DumpRemainingCommand(IAnsiConsole console)
+        {
+            _console = console;
+        }
+
+        public override int Execute([NotNull] CommandContext context, [NotNull] EmptyCommandSettings settings)
+        {
+            if (context.Remaining.Raw.Count > 0)
+            {
+                _console.WriteLine("# Raw");
+                foreach (var item in context.Remaining.Raw)
+                {
+                    _console.WriteLine(item);
+                }
+            }
+
+            if (context.Remaining.Parsed.Count > 0)
+            {
+                _console.WriteLine("# Parsed");
+                foreach (var item in context.Remaining.Parsed)
+                {
+                    _console.WriteLine(string.Format("{0}={1}", item.Key, string.Join(",", item.Select(x => x))));
+                }
+            }
+
+            return 0;
+        }
+    }
+}