LuaClass fails to handle some constructor cases

[SirLynix]

When constructing an object, that (empty) object is pushed on the Lua stack before the constructor function is called.

    template<class T>
    int LuaClass<T>::ConstructorProxy(lua_State* state)
    {
        LuaInstance& lua = *LuaInstance::GetInstance(state);

        std::shared_ptr<ClassInfo>& info = *static_cast<std::shared_ptr<ClassInfo>*>(lua.ToUserdata(lua.GetIndexOfUpValue(1)));
        const ConstructorFunc& constructor = info->constructor;

        lua.Remove(1); // On enlève l'argument "table" du stack

        T* instance = static_cast<T*>(lua.PushUserdata(sizeof(T))); //<<<<<< HERE

        if (!constructor(lua, instance))

which induce an extra parameter of type "userdata" on every constructor.