add msg handling (#1737)

dGame/Entity.h

@@ -14,12 +14,17 @@
 #include "Observable.h"
 
 namespace GameMessages {
+	struct GameMsg;
 	struct ActivityNotify;
 	struct ShootingGalleryFire;
 	struct ChildLoaded;
 	struct PlayerResurrectionFinished;
 };
 
+namespace MessageType {
+	enum class Game : uint16_t;
+}
+
 namespace Loot {
 	class Info;
 };
@@ -316,6 +321,10 @@ public:
 	// Scale will only be communicated to the client when the construction packet is sent
 	void SetScale(const float scale) { m_Scale = scale; };
 
+	void RegisterMsg(const MessageType::Game msgId, std::function<bool(GameMessages::GameMsg&)> handler);
+
+	bool HandleMsg(GameMessages::GameMsg& msg) const;
+
 	/**
 	 * @brief The observable for player entity position updates.
 	 */
@@ -377,6 +386,8 @@ protected:
 
 	// objectID of receiver and map of notification name to script
 	std::map<LWOOBJID, std::map<std::string, CppScripts::Script*>> m_Subscriptions;
+
+	std::multimap<MessageType::Game, std::function<bool(GameMessages::GameMsg&)>> m_MsgHandlers;
 };
 
 /**