[Quest API] Add Scripting Support to Mercenaries (#4500)

* [Quest API] Add Scripting Support to Mercenaries

* Cleanup

* Cleanup

* Update lua_merc.h

* Update mob.cpp

* XYZH

* Final

* Update attack.cpp

* Update attack.cpp

* Simplify event invocation

* Inline example

* Nullptr init example

* EVENT_TIMER simplify add EventPlayerNpcBotMerc

* EVENT_TIMER_START

* Remove has_start_event

* EVENT_TIMER_START with settimerMS

* EVENT_POPUP_RESPONSE

* Consolidation

* Update attack.cpp

* Push

* Update quest_parser_collection.h

* Comments

* Cleanup per comments

---------

Co-authored-by: Akkadius <akkadius1@gmail.com>

zone/lua_entity.h

@@ -7,6 +7,7 @@
 class Entity;
 class Lua_Client;
 class Lua_Bot;
+class Lua_Merc;
 class Lua_NPC;
 class Lua_Mob;
 struct Lua_HateList;
@@ -59,6 +60,7 @@ public:
 	Lua_Object CastToObject();
 	Lua_Door CastToDoor();
 	Lua_Bot CastToBot();
+	Lua_Merc CastToMerc();
 };
 
 #endif