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

Fixed minor typos.

First load shot then send message

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

Reviewed by: Zoey76, !UnAfraid

	* Reviewed by: Zoey76

	* Removed lot of casting.

'''Note:''' If you get errors on your custom scripts after synchronizing, just check and change methods from getXXXId() to getId().

	* 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.

	* Fixing NPE for summon shots:
		* Reported by: valdaron
	* Removing double teleport for summons.
		* Core already teleport the summon when teleporting the player!

Patch by: UnAfraid

	* Unhardcoding most of skill ids
	* Fixed some typos
	* Added missing system messages
	* Added some TODO: comments
	* Decreasing range of shot skill broadcasts

	* Wondrous Cubic - 1 time use should be consumed upon usage.
	* Added more missing GPL notices.
	* Implemented Calculator item handler.
	* Moved some high time reuses from items skills to it's items, it's a temp fix for missing global skill reuse, since item reuse is global to all classes.
	* Removed custom check based on skill type for Extractable skills with high reuse not being able to be used in sub-classes.

	* 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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handler defined inside etcitem table
require [L3107]