Ammo pickup improvements + ammo crate for singleplayer

[HonestResolv3]

Added:

• Ammo crate for Singleplayer

Fixed:

• Weapon ammo pick ups not utilizing reserve ammo properly (or full magazines)
• Weapon pick up message not appearing

Notes:

• Shotguns will utilize both item\state and item\state2 when giving ammo. In Multiplayer it is the same except by default it will give 8.
• Rifles & Pistols will utilize more than 1 magazine by utilizing item\state (if the state is greater than or equal to max current ammo) and item\state2.
• Ammo crate gives 2 magazines and 16 shotgun shells