Core/Scripts: Bring Yogg-Saron back on top of this branch
Core/Scripts:

- fix some of Yogg-Saron's achievements
- make Descend Into Madness npcs teleport players into selected illlusion room
- visual fixes
- remove some of SpellMgr hacks
- set some timers and connect first 2 phases so we are finally able to get into the second one now
Core/Scripts: More improvements for Yogg-Saron.
Core/Scripts: Script for spell Induce Madness and 2 Yogg-Saron's npcs
Core/Scripts: Improve Sanity handling
Core/Scripts: Fix Insanity and some achievements
Core/Scripts:

- fixed Empowering Shadows and Diminish Power spells
- set most of the remaining timers
- partially fixed Hodir's Protective Gaze
- more improvements
Core/Scripts:

- finally got missing data from sniffs
- fixed Death Ray spell
- skip hacky check for spell Malady of the Mind - now the jump effect works properly
- added basic script for keepers at Observation Ring
- fixed Insane Periodic spell - not sure about this one
Core/Scripts: Implement keepers for Yogg-Saron encounter
Core/Scripts:

- fix Constrictor Tentacles
- fix In the Maws of the Old God spell required for completing Val'anyr quest line
- fix Immortal Guardians entry switching when they are marked by Shadow Beacon
- fix movement of Ominous Clouds
- restrict targets for some spells (do not cast them on players inside Illusion Rooms)
- convert some target filters into conditions
- prepare script for Hate to Zero spell
Core/Scripts:

- fix all in the Darkness achievements
- fix issues with Sanity not being removed sometimes
- use all remaining texts
- other miscellaneous fixes
Core/Scripts: Remove some no more needed hacks, fix Descend Into Madness spellclick conditions and clouds' movement and add some basic support for illusion handling (open the door, activate Laughing Skulls etc.) - this one needs to be rewrited
Core/Scripts: Fix build after recent merge and partially revert b6f66c974bcd081cde90c080616c35099fa4b711 - vehicle auras still don't work properly
Core/Scripts:

- correct some DB stuff and spawn missing npcs
- convert Grim Reprisal to spellscript
- implement illusion roleplays, will need some corrections and npc respawn
- fix Laughing Skulls
Core/Scripts: Fix compile after recent merge and make 2 minor improvements
Core/Scripts: Use the new summon groups system in Yogg-Saron's script, fix the compile and make minor improvements