Dev crate

New crate component added to f/assignGear.
- added crate_small, crate_med and crate_large unit classes to all factions.
- added (untested) vanilla-to-AGM-medical-items converter.
- new functionality in the assignGear function: can now define the faction to be used as an optional, third, parameter in the function call.

Note: Wierd stuff happening, other files than those I modified get included. The correct modified ones are:
- the f/assignGear folder;
- f/medical/AGM_converter.

Unsure how to fix, am not GitHub wizard.