- Added proper handling of pistol mags and regular mags in gear to
prevent magazine overflow
- Added pre-check if return change will overflow gear + backpack free
space. If change will not fit in gear + backpack free space then buy is
prevented with a message notifying the player. In the case of a sale it
proceeds anyway, but notifies player if overflow occurs (see comments in
returnChange)
- Consolidated duplicate code for calculating free space and returning
cargo of an object into new calcFreeSpace
- Old calculateFreeSpace renamed to displayFreeSpace
- Added Weps/Mags/Bags icons to free slot numbers display
