Patch by: Zephyr
Reported by: CostyKiller
Tested by: CostyKiller

- 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.

Reviewed by: Zoey76, !UnAfraid

	* Patch by: jurchiks
	* Reviewed by: xban1x

	
	* Reviewed by: Zoey76, UnAfraid, jurchiks