Added missing copyright notice.

General cleanup.

Private methods don't need to be final.
Enums don't need to be static.
Public methods in final classes don't need to be final.
Added Eclipse formatter.

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

- 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.

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

- 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.

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@2f3dca83e5317b7471ac1bf472067e9ad1a85003

	* Unhardcoded some HTMLs.
	* Renamed `INSTNACEID` to `TEMPLATE_ID`.
	* Fixed missuse of template ID and instance ID in multiple instances.
	* Fixed Ranku, Demon Prince, Urban Area, Monastery Of Silence, Library Of Sages.

Reported by: !FinalDestination, !CostyKiller, JOJO

Patch by: St3eT
Reviewed by: UnAfraid, Zoey76

Reviewed by: Zoey76, !UnAfraid

	Reported by: kostantinos

	'''NOTE:''' Freya Feature.