add child loading (#1706)

Tested that the NT combat challenge, am skullkin towers and qa wall in avant gardens all function as before.

dGame/Entity.cpp

@@ -775,6 +775,12 @@ void Entity::Initialize() {
 	// Hacky way to trigger these when the object has had a chance to get constructed
 	AddCallbackTimer(0, [this]() {
 		this->GetScript()->OnStartup(this);
+		if (this->m_ParentEntity) {
+			GameMessages::ChildLoaded childLoaded;
+			childLoaded.childID = this->m_ObjectID;
+			childLoaded.templateID = this->GetLOT();
+			this->m_ParentEntity->OnChildLoaded(childLoaded);
+		}
 		});
 
 	if (!m_Character && Game::entityManager->GetGhostingEnabled()) {
@@ -1501,6 +1507,10 @@ void Entity::OnShootingGalleryFire(GameMessages::ShootingGalleryFire& fire) {
 	GetScript()->OnShootingGalleryFire(*this, fire);
 }
 
+void Entity::OnChildLoaded(GameMessages::ChildLoaded& childLoaded) {
+	GetScript()->OnChildLoaded(*this, childLoaded);
+}
+
 void Entity::RequestActivityExit(Entity* sender, LWOOBJID player, bool canceled) {
 	GetScript()->OnRequestActivityExit(sender, player, canceled);
 }

dGame/Entity.h

@@ -16,6 +16,7 @@
 namespace GameMessages {
 	struct ActivityNotify;
 	struct ShootingGalleryFire;
+	struct ChildLoaded;
 };
 
 namespace Loot {
@@ -217,6 +218,7 @@ public:
 	void OnZonePropertyModelRotated(Entity* player);
 	void OnActivityNotify(GameMessages::ActivityNotify& notify);
 	void OnShootingGalleryFire(GameMessages::ShootingGalleryFire& notify);
+	void OnChildLoaded(GameMessages::ChildLoaded& childLoaded);
 
 	void OnMessageBoxResponse(Entity* sender, int32_t button, const std::u16string& identifier, const std::u16string& userData);
 	void OnChoiceBoxResponse(Entity* sender, int32_t button, const std::u16string& buttonIdentifier, const std::u16string& identifier);

dGame/dGameMessages/GameMessages.h

@@ -758,6 +758,13 @@ namespace GameMessages {
 		NiPoint3 target{};
 		NiQuaternion rotation{};
 	};
+
+	struct ChildLoaded : public GameMsg {
+		ChildLoaded() : GameMsg(MessageType::Game::CHILD_LOADED) {}
+
+		LOT templateID{};
+		LWOOBJID childID{};
+	};
 };
 
 #endif // GAMEMESSAGES_H