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.

Reviewed by: Zoey76, !UnAfraid

	* Proper GPLv3 license.
	* Updated all Java DP files.
	* Added missing license to the following files:
		* !FirstClassTransferTalk
		* !AdminInstanceZone
	* Updated Eclipse preferences for new files (header).
		* ''Same'' settings as Core.

	* Refactored user commands.
	* Format and cleanup.
	* Retail like ChannelLeave, ClanWarsList.

	* Fixed Scroll of Resurrection typo from [8679], thanks baluu for report.
	* Fixed JavaDocs, removed non-JavaDocs comments and some @see JavaDocs.
	* Formatted CancelDebuff class.

	* Using same Code warning/error configuration than core.
	* Fixed respective warnings and errors.
	* Fixing Extractable Skills restriction properly.
		1. Unhardcode Skills Ids.
		1. Now only Item Skills are restricted.
		1. Items with consume count won't be consumed without giving the reward.
		1. Applied to reuse time greater than 5 seconds, there is no point on restrict item skills with less reuse time.
		1. Unhardcoded system message for item reward.
	* Hellbound fixes:
		1. Hellbound should start closed at server start (level 0), thanks Trev.
		1. Quarry ClassCastException fix.
	* Q290_ThreatRemoval removed unnecessary int cast.
	* Q636_TruthBeyond proper method to get an int.
	* Skill Santa Claus' Gift - Luck(22018) typo fix.

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