Added AI Loader class.
Removed most main methods from scripts.
Added Treasure AI that was missing in loading.

Added config reload and test.

Moved to Maven instead of Gradle.
Using proper project structure and package structure.

Moved to Maven instead of Gradle.
Using proper project structure and package structure.

Fixed minor typos.

Moving all files to main folder.
Using Gradle to define, manage dependecies and build the project.
Upgraded Gradle wrapper.

Included source cleanup.

	* Reported by: SoulScreamers

	* New Datapack sided Hellbound Engine.
	* Using one class-loader for all Hellbound related scripts:
		* Faster loading and allows "communication" between scripts.
		* Allows disabling Hellbound completely by just removing the class-loader from scripts.cfg.
	* Static Hellbound's spawn data moved from SQL to XML.
	* Removed `HellboundManager`.
	* Reviewed all the Hellbound related scripts:
		* Finalized all classes and removed main method.
		* Added !JavaDocs.
		* Removed the usage of `QuestState`, it's not required at all at AIs.
		* Moved constructor at the top of the class after fields declaration.

Reviewed by: xban1x, UnAfraid, St3eT, Konstantinos