Player persistence update

- Player persistence is now configurable as part of config.sqf
- Additionally you can enable a "donation" system which allows players to spawn in with more money
- Removed many instances of setup.sqf which contained old Arma2 code
- Minor improvements to logging, on-screen text and comments in a few places
- fn_fitsInventory now returns where the object can fit. Uniform, vest or backpack (or none of those)
- Normalized the mf_item_ids assigned to each player inventory object for better consistency