Core/Spells: moved Improved Paladin Auras and Aura Mastery into SpellScripts

Closes #205
Closes #5163
Closes #6809
Closes #7408
Closes #9587
Scripts/Spells: simplified "spell_dk_presence"
Scripts/Spells: Fixed typo in 7678800a9372f9234f0bf29459b46a8514dc59f2