Setting up TAW-friendly units/gear

-Deleted old files (not needed)
-added MH-9, AH-9 and Mohawk
-added Marksman class and gear for it (MRCO and ABR)
-set Alpha-Delta 12-man squads. Using group names in format "GrpNATO_A1"
for Alpha, "GrpNATO_B1" for Bravo.

-leaving pilot/crew/driver and weapons groups as is
-may have an issue with the "pre-mount vehicles" game logics.