[12654] Add new Regen Health / Power flags and rename database fields accordingly
[12655] Implement generic power handling for Creatures and Pets

Signed-off-by: Xfurry <xfurry@scriptdev2.com>
[12656] 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
[12657] Set correct power type for vehicles based on PowerDisplay.dbc