Core: Whitespace cleanup
Core/Spells: Defined two spell attributes
Core/Spells: Defined & implemented SPELL_ATTR6_IGNORE_CATEGORY_COOLDOWN_MODS
Core/Spells: Defined spell attributes related to aura visibility
DB/Quests: Fixes Through the Eye (13121), closes #9070

Thanks @Kirkhammet for inital work
Scripts/Eye of Eternity: Surge of Power (25 man)

* I have no idea how these breaks were removed, but it was breaking the whole mechanic.
* Also fix some slight chance for fail of transitioning p II -> p III
* Surge of Power (25 man) still needs to get fixed some weird facing and warnings aren't always sent for some reason
Scripts/Eye of Eternity: Remove some flags, fix some timers and some misc

* Starting timers were a bit slower
* Destroy platform proper timing for drake casting mount spell to player (trigger)
* Remove IMMUNITY_PC flag after Iris is triggered (thx to Expecto) and readd it on evade
* Remove NOT_SELECTABLE flag since shouldn't be present at starting event
* Fix misc of id of Static Field added to LOS attributes
DB/Quests: Fixes To Legion Hold (10563,10596). Closes #9153,  #6909

Thanks @Kirkhammett for the initial work.
Core/Vehicles: Defined known seat flag VEHICLE_SEAT_FLAG_IS_USING_VEHICLE_CONTROLS
Core/GameObjects

* Removed long deprecated code for mining nodes (multiple uses, artifact of TBC)
* Made fishing pools generate use count only on spawn (and respawn) instead of randomizing use count on every fishing attempt - prevents early despawning in some cases
Scripts/Eye of Eternity: Rewrite Arcane Barrage mechanic

* Note that even after last changes happens I'm not sure exactly how the timers are controlled. The wipe chance should be a lot smaller now.. Any further change I can think of is beyond what I see. The main problem is currently. In theory there is chance, If timers get to be same with delay lesser than 2 seconds and if target randomisations select same target for shit out of luck reason. And if starting different timers were matching you can be hit atleast 2-3 times and on 25 mode maybe more. The timers are not with fixed difference for sure is all I know.
DB/Misc:

Add Missing Sunreaver Guardian Mage (thx aokromes) Closes #9311
Add SAI for Mission: The Abyssal Shelf (thx Kirkhammett)
DB/SAI: Add SAI for quest "A Worthy Weapon"

Closes #9250
SQL: Fix typo
Core/Spells: Improved facing setting for creature casts
Move complex functions from Unit.h to Unit.cpp
Move complex functions from Object.h to Object.cpp
Core/Entities: Move complex function implementations from Creature.h to Creature.cpp
DB/Gameobject: Add missing Gameobject

Closes #8948
DB/Waypoints: add waypoints for Doomsayer Jurim, thx Kelsarhu

Closes #8958