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/Spectre.Console.Tests.csproj

@@ -0,0 +1,44 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFrameworks>net5.0</TargetFrameworks>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Include="..\..\src\Spectre.Console\Cli\Internal\Constants.cs" Link="Imported\Constants.cs" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Remove="Data\starwars.flf" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <EmbeddedResource Include="Data\starwars.flf" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Analyzer.Testing.XUnit" Version="1.1.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.CodeFix.Testing.XUnit" Version="1.1.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="2.6.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.8.3" />
+    <PackageReference Include="Shouldly" Version="4.0.3" />
+    <PackageReference Include="Spectre.Verify.Extensions" Version="0.3.0" />
+    <PackageReference Include="Verify.Xunit" Version="9.0.0-beta.1" />
+    <PackageReference Include="xunit" Version="2.4.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\Spectre.Console.Analyzer\Spectre.Console.Analyzer.csproj" />
+    <ProjectReference Include="..\..\src\Spectre.Console.Testing\Spectre.Console.Testing.csproj" />
+    <ProjectReference Include="..\..\src\Spectre.Console\Spectre.Console.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Folder Include="Expectations\Widgets\Tree\" />
+  </ItemGroup>
+
+</Project>