DB/Misc: Random fixes/error fixes
Core/Group: Update enum GroupType
Add HoverHeight to GetMeleeReach() so that IsWithinMeleeRange() returns correct value on hovering units.
Add HoverHeight to GetMeleeReach() so that IsWithinMeleeRange() returns correct value on hovering units.
DB/Misc: Couple more fixes

closes #13112
closes #13115
Remove mount vendor cpp script