Added missing copyright notice.

General cleanup.

Fixed Summoners minions
Fixed issue #168

Added config reload and test.

Organizing all imports.

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.

Patch by: St3eT
Reviewed by: UnAfraid, Nos, Zoey76

	* 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