ADDED: Ability to save rank in-game by using the ATM at the bank.
ADDED: Loading screen tip for saving rank.
CHANGED: Turret and vehicle HUDs can now be turned off.
CHANDED: Turret ammo icon will now turn red in turret HUD if the ammo is low.
FIXED: HUD won't stay off when exiting turret.
FIXED: Helicopter battle music not faded out when exiting level.