Move CSharpCodeMatcher to a new project (#548)

* matcher

* wip

* fix

* <VersionPrefix>1.4.0</VersionPrefix>

* .

* x

* ?

* netstandard2.1

* {}

* test

* Fix: Assembly with same name is already loaded

* _format file

* AssemblyFile = $"WireMock.CodeHelper.Class{Guid.NewGuid()}"

* AssemblyFile = $"WireMock.CodeHelper.Class{Guid.NewGuid().ToString().Replace("-", "")}"

* GC

* x

* remove load ex

* ret

* readme

* no GC

* GetImplementationTypeByInterface

* ``

* PluginLoader

* type

test/WireMock.Net.Tests/WireMockAdminApiTests.cs

@@ -1,4 +1,5 @@
-using System;
+#if !NET452 && !NET461
+using System;
 using System.Linq;
 using System.Net.Http;
 using System.Net.Http.Headers;
@@ -552,4 +553,5 @@ namespace WireMock.Net.Tests
             server.Stop();
         }
     }
-}
+}
+#endif