Edited CSAT to fit Alternative

Changes:
- All CSAT units edited to fit CSAT Alternative (Arid) besides Helicopter Pilots (no Alternative)
- Edited CSAT gear:
     - AK74 GL for SL,TL,CO
     - AK12 for Assistant AARs etc
     - AK74S for Medic etc (Carbine)
     - Added medical gear for everybody, copied from NATO gear