Reported by: Darkloud91

- 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.

	* Retail like and separated quest from instance to match other similar scripts.

Patch by: St3eT
Reviewed by: Aikimaniac, Zoey76