Added `CCodeGenerator.GenerateClassBody` extension point.

src/Generator/Generators/C/CCodeGenerator.cs

@@ -234,7 +234,7 @@ namespace CppSharp.Generators.C
             NewLine();
             WriteOpenBraceAndIndent();
 
-            VisitDeclContext(@class);
+            GenerateClassBody(@class);
 
             Unindent();
             WriteLine("};");
@@ -244,6 +244,11 @@ namespace CppSharp.Generators.C
             return true;
         }
 
+        public virtual bool GenerateClassBody(Class @class)
+        {
+            return VisitDeclContext(@class);
+        }
+
         public override bool VisitTypedefNameDecl(TypedefNameDecl typedef)
         {
             return true;