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/VerifyConfiguration.cs

@@ -0,0 +1,15 @@
+using System.Runtime.CompilerServices;
+using Spectre.Verify.Extensions;
+using VerifyTests;
+
+namespace Spectre.Console.Tests
+{
+    public static class VerifyConfiguration
+    {
+        [ModuleInitializer]
+        public static void Init()
+        {
+            VerifierSettings.DerivePathInfo(Expectations.Initialize);
+        }
+    }
+}