add missing CodeGenerationService to refactoring context: fixes availability of "implement interface" et al.

src/AddIns/BackendBindings/CSharpBinding/Project/CSharpBinding.csproj

@@ -121,6 +121,7 @@
     </Compile>
     <Compile Include="Src\Refactoring\PropertyOrFieldWrapper.cs" />
     <Compile Include="Src\Refactoring\RenameFileToMatchTypeNameContextAction.cs" />
+    <Compile Include="Src\Refactoring\SDCodeGenerationService.cs" />
     <Compile Include="Src\Refactoring\SDNamingConventionService.cs" />
     <Compile Include="Src\Refactoring\SDRedundantUsingIssue.cs" />
     <Compile Include="Src\Refactoring\EditorScript.cs" />

src/AddIns/BackendBindings/CSharpBinding/Project/Src/Refactoring/SDCodeGenerationService.cs

@@ -0,0 +1,12 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using ICSharpCode.NRefactory.CSharp;
+
+namespace CSharpBinding.Refactoring
+{
+	sealed class SDCodeGenerationService : DefaultCodeGenerationService
+	{
+	}
+}

src/AddIns/BackendBindings/CSharpBinding/Project/Src/Refactoring/SDRefactoringContext.cs

@@ -90,6 +90,7 @@ namespace CSharpBinding.Refactoring
 		{
 			this.Services = new ServiceContainer(SD.Services);
 			this.Services.AddService(typeof(NamingConventionService), new SDNamingConventionService());
+			this.Services.AddService(typeof(CodeGenerationService), new SDCodeGenerationService());
 		}
 		
 		public override bool Supports(Version version)