Scripts/The Storm Peaks: Use proper vehicle check on prisoners from Cold Hearted quest.
Core/Vehicles: Implemented vehicle seat flag that makes passengers unselectable and dropped redundant UNIT_STATE_ONVEHICLE (it is only checked in the same places as unselectable unit flag)
DB/SAI: Convert Felblood Initiate to SAI and fix runtime warning
DB/Misc:

 - Convert c_t_a entry into c_a to prevent errors
 - Allow mounting in Black Temple <outdoor parts>
 - fix by exodius to add sound for Corrupted Ashbringer
Closes #9997
DB/creature: another c_t_a to c_a convert
DB/SAI: Fix several runtime warnings / logical mistakes

* Wrong event types for linked events
* Possible multiple AI template initialization
Rename SQL file and add new line at end of file
Core/Scripting: A few fixes for Blackrock Spire. Emberseer now setting properly after wipe and Gyth/Rend event is getting closer to complete.