[c12638] Simple fix for Stealth is removed on fall damage problem.
Surely could be done better way...
Can be backported but need a little more work to make it work on
TBC/Classic

Credits to cyberium
[c12641] Implement dummy effect of spell 63125
Credits to NeatElves
[c12642] Implement SMSG_INVALIDATE_PLAYER
Inspired by TC and R2

Credits to Littlecarl
[c12643] Implement movement limitations for vehicles based on vehicle
flags
Credit to xfurry and Machiavelli
[c12644] Implement vehicle SEAT_FLAG_NOT_SELECTABLE
Based on the work of @Shauren
Credit to xfurry
[c12647] Let vehicle actionbar initialization independent of
SEAT_FLAG_USABLE
Credit to kid10
[c12648] Add some missing vehicle seat flags
Based on the original work of @Machiavelli
Credits to kid10 and Xfurry as well
[c12649] Improve usable player seat condition
Inspired by the original work of @Machiavelli
Credits to Xfurry and kid10 as well
[c12650] Add some additional safety checks to vehicle interaction packet
processing.
Credits to kid10 and Xfurry
[c12652] Fix creature not stopping in some conditions
Patch imported from TC, original author @Shauren
Credits also to cyberium
[c12658] Sending spline speed instead of complete movement info seem
enough no matter if the unit is Player or Creature.
Credits to @SilverIce and @cyberium
[c12654] Add new Regen Health / Power flags and rename database fields
accordingly.
Credit to xfurry
[c12655] Implement generic power handling for Creatures and Pets
Credits to kid10
[c12656] Initialize power type and power type values for creatures
This will assign the correct power type based on UnitClass and will also
provide proper values for the scaled powers
Credit to xfurry