Add CSharpCodeMatcher (#324)

* wip

* fix

* .

* windows-2019

* <Target Name="CheckIfShouldKillVBCSCompiler" />

* <!--https://github.com/aspnet/RoslynCodeDomProvider/issues/51-->

* AllowCSharpCodeMatcher

* CSharpCodeMatcher : IObjectMatcher

* TemplateForIsMatchWithDynamic

* RequestMessageBodyMatcher_GetMatchingScore_BodyAsJson_CSharpCodeMatcher

* fix

*  }

* Better Exception Handling

src/WireMock.Net/Settings/IFluentMockServerSettings.cs

@@ -1,6 +1,6 @@
-using HandlebarsDotNet;
+using System;
+using HandlebarsDotNet;
 using JetBrains.Annotations;
-using System;
 using WireMock.Handlers;
 using WireMock.Logging;
 
@@ -115,9 +115,14 @@ namespace WireMock.Settings
         IFileSystemHandler FileSystemHandler { get; set; }
 
         /// <summary>
-        /// Action which can be used to add additional is Handlebar registrations. [Optional]
+        /// Action which can be used to add additional Handlebars registrations. [Optional]
         /// </summary>
         [PublicAPI]
         Action<IHandlebars, IFileSystemHandler> HandlebarsRegistrationCallback { get; set; }
+
+        /// <summary>
+        /// Allow the usage of CSharpCodeMatcher (default is not allowed).
+        /// </summary>
+        bool? AllowCSharpCodeMatcher { get; set; }
     }
 }