[Quest API] Export target to EVENT_TARGET_CHANGE in Perl/Lua. (#2870)

* [Quest API] Export target to EVENT_TARGET_CHANGE in Perl/Lua.

- Export `$target` to `EVENT_TARGET_CHANGE`.

- Export `e.other` to `event_target_change`.

- Allows operators to not have to grab bot, Client, or NPC's target in Perl with `GetTarget()`.
- Allows operators to not have to grab Client's target in Lua with `GetTarget()`.

* Update mob.cpp

* Update mob.cpp

* Update mob.cpp

zone/lua_parser_events.h

@@ -698,6 +698,15 @@ void handle_player_destroy_item(
 	std::vector<std::any> *extra_pointers
 );
 
+void handle_player_target_change(
+	QuestInterface *parse,
+	lua_State* L,
+	Client* client,
+	std::string data,
+	uint32 extra_data,
+	std::vector<std::any> *extra_pointers
+);
+
 // Item
 void handle_item_click(
 	QuestInterface *parse,