- Replaced SkillData.getInstance().getSkill with SkillHolder DTO;
- Replaced Skill versions of doCast and doSimultaneousCast with
SkillHolder ones;
- Fixed typo on Sanctum of the Lords of Dawn instance zone;
- Some cleanup.

https://bitbucket.org/l2jserver/l2j_server/commits/e70d93fb205f4de4443c1c9a431dc5c8be70297e

Fixed minor typos.

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

L2J/L2J_Server@0854ed868ff6b09917ebbc4731b6a9e14cfc9c3f.

* Reviewed by: Zoey76, Adry_85

Reviewed by: Zoey76, !UnAfraid

	* Some clean of code.
	* Added support for Morale Boost buff.
	* Added summon animation onSpawn for some NPCs.
	* Drakos Hunter, Drakos Warrior and Drakos Guardian now spawn 3-5 Drakos Assassin.

Patch by: St3eT
Tested by: St3eT, FinalDestination
Reviewed by: lion, Zoey76

'''Note:''' High Five feature.

	* Cleanup.

	* Patch by: jurchiks
	* Reviewed by: xban1x

	* Removed lot of casting.

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

	* Reworking Necromancer of the Valley AI.
	* Added herb drop for some monster.
	
	Patch by: St3eT
	Reviewed by: Adry_85, malyelfik, Zoey76
	Tested by: FinalDestination
	Thanks to: FinalDestination