I don't think we should allow selling backpacks from vehicles because we
can not get backpack contents.
We can only remove all backpacks with clearBackpackCargo and then add
back new empty backpacks for ones that weren't sold.
This means players may unintentionally wipe all contents of all other
backpacks in their vehicle when they only want to sell one.
Thanks @AirwavesMan for catching this.
Also made changes discussed in #1718 @oiad
- 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
