feat: add messaging system for manager and add example usage to Loot (#1837)

tested that loot still drops at the entities position

dGame/dGameMessages/GameMessages.cpp

@@ -6312,6 +6312,10 @@ void GameMessages::SendUpdateInventoryUi(LWOOBJID objectId, const SystemAddress&
 }
 
 namespace GameMessages {
+	bool GameMsg::Send() {
+		return Game::entityManager->SendMessage(*this);
+	}
+
 	void GameMsg::Send(const SystemAddress& sysAddr) const {
 		CBITSTREAM;
 		CMSGHEADER;