DB/Spells: Opening spell  (id: 61437)added to some of Blood Elf's classes

* Add missing generic spell for opening chests for most of Blood Elf's classes. It was preventing them to loot in Eye of Eternity Alexstrasza's Gift Box, Heart of Magic and maybe more.
Scripts/Eye of Eternity: Rewrite most of it.

Closes: #1133,  #8212, #1150, #5003, #6794

* More stuff will be done, a lot to clean maybe, as of raiding it's good to go now.
* Big thx to Shauren, Horn, manuel, Machiavelli, Nay, Krofna and rest who helped.