[Quest API] Add MaxSkills() to Perl/Lua. (#2621)

* [Quest API] Add MaxSkills() to Perl/Lua.

# Perl
- Add `$client->MaxSkills()`.

# Lua
- Add `client:MaxSkills()`.

# Notes
- Allows operators an easy short hand for maxing a player's skills for their level without needing to do all the looping and stuff on their own.

* Cleanup.

* Only set if it's higher than skill level player has.

* Add constant.

zone/lua_client.h

@@ -453,6 +453,7 @@ public:
 	void SendPayload(int payload_id);
 	void SendPayload(int payload_id, std::string payload_value);
 	std::string GetGuildPublicNote();
+	void MaxSkills();
 
 	void ApplySpell(int spell_id);
 	void ApplySpell(int spell_id, int duration);