Need to text2num all integers in DB
Adds Wheelchairs with basic driving functionality

Conflicts:
	baystation12.dme
	icons/obj/objects.dmi
Makes crashing into things possible with extinguisher or harm intent
Fixes. Wheelchair is supposed to help the occupant and not the driver, damn it.
Wheelchairs spawn on footless characters

Conflicts:
	code/modules/client/preferences.dm
Merge pull request #186 from ZomgPonies/master

Wheelchairs and fixes