BETA: Unhardcoding Quests names using NpcStrings.

 * Thanks '''tukune''' for first implementation.
 * Thanks '''centrio''' for morphism algorithm for Quest Ids and Npc Strings Ids.
 * Support for custom quests and code refactoring by me.
'''Note:''' Custom quest scripts should use and Id not listed in client and set to custom script using setIsCustom(true).