Fountain of PEW!th

In this update i create an item_ammo_cache entity that is used to supply players with max ammo for all weapon ammo types available. This is beta but currently is capable of being assigned as any model (as displayed as a crate), can color overlay, has cool down encoding for spam control, encoded usage limit (-1 infinite), team filters, start disabled and hammer I/O via func_button / triggers etc and handles via Pressing E like everything else. This completes the full crown of total weapon and item handling reform.