Fixed invalid declaration name cleaning.

It could happen that by visiting the types of declarations, we'd wrongly reset the unique names counter. In this specific case, this was happening while visiting an event and its parameters.

src/Generator/Passes/CleanInvalidDeclNamesPass.cs

@@ -23,6 +23,11 @@ namespace CppSharp.Passes
             return name;
         }
 
+        public override bool VisitType(AST.Type type, TypeQualifiers quals)
+        {
+            return false;
+        }
+
         public override bool VisitDeclaration(Declaration decl)
         {
             // Do not clean up namespace names since it can mess up with the