Work on making userdata work through extern C entry points

src/UserData/UserDataField.cpp

@@ -1,2 +1,8 @@
 
 #include "UserDataField.hpp"
+
+extern "C"{
+    UserDataField* CreateUserDataField(ScriptType* type, EvalValue* (*getter)(void* obj), void (*setter)(void* obj, EvalValue* val)){
+        return new UserDataField(type, getter, setter);
+    }
+}