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/Unit/Cli/CommandAppTests.Settings.cs

@@ -0,0 +1,26 @@
+using Shouldly;
+using Spectre.Console.Cli;
+using Xunit;
+
+namespace Spectre.Console.Tests.Unit.Cli
+{
+    public sealed partial class CommandAppTests
+    {
+        [Fact]
+        public void Should_Apply_Case_Sensitivity_For_Everything_By_Default()
+        {
+            // Given
+            var app = new CommandApp();
+
+            // When
+            var defaultSensitivity = CaseSensitivity.None;
+            app.Configure(config =>
+            {
+                defaultSensitivity = config.Settings.CaseSensitivity;
+            });
+
+            // Then
+            defaultSensitivity.ShouldBe(CaseSensitivity.All);
+        }
+    }
+}