Added Rangers to high command and unit purchase menu for HQ and FOBs

Added 101st and 82nd Airborne to Unit and High Command purchase menus for HQ and FOBS. Changed the non ai recruiting squad for COOP to 101st Airborne.

Just changed the high command single sherman tank and tank section back to non winter versions (oversight from copying and pasting scripts from western front version.)

Fixed ammo box supprt. Renamed High command HUD names. Added protective wall to HQ from AA gun shooting into HQ building.

Added single tank units into high command, useful for HQ and FOB protection . Added protective wall from AA gun shooting HQ and killing the commander

Added tank crew to unit recruitment. Changed startup music. Changed MTV mission vehicle to M3 Scout Car. Changed Defuse mission vehicle from Panther Tank to Sherman Firefly Tank. Changed default attack planes spawn to enabled (attack planes spawn for both sides in controlled zones by default)

Added Earplugs. Added P39 fighter support and empty vehicle purchase option. Changed HQ building. Changed some modern objects in enemy zones to older looking ones. Changed music loop and dynamic music to Iron Front music

Changed HQ and FOB buildings to something more appropriate Changed HQ and FOB fortifications to Russian Guns

Fixed allies shooting at player