优化ProxyCall的规则，暂时不对mscorlib及GetEnumerator函数混淆

Editor/ProxyCall/ConfigProxyCallPolicy.cs

@@ -20,11 +20,24 @@ namespace Obfuz.DynamicProxy
             ITypeDefOrRef declaringType = method.DeclaringType;
             TypeDef typeDef = declaringType.ResolveTypeDef();
             // doesn't proxy call if the method is a delegate
-            if (typeDef != null && typeDef.IsDelegate)
+            if (typeDef != null)
+            { 
+                // need configurable
+                if (typeDef.Module.IsCoreLibraryModule == true)
+                {
+                    return false;
+                }
+                if (typeDef.IsDelegate)
+                    return false;
+            }
+            // doesn't proxy call if the method is a constructor
+            if (method.Name == ".ctor")
             {
                 return false;
             }
-            if (method.Name == ".ctor")
+            // special handle
+            // don't proxy call for List<T>.Enumerator GetEnumerator()
+            if (method.Name == "GetEnumerator")
             {
                 return false;
             }