Redo of zone_sel/Click() to be much simpler. Zone_sel is the paper doll on the screen where you choose what body part to target. Fewer sections under switch statements, plus a check to only update the icon if there's been a change.

tgstation.dme is a fixed version without FILE_DIR set. Gitblame!
Merge pull request #798 from MrPerson/zone_sel

Redo of zone_sel/Click() to be much simpler.                                                             Zone_sel is the paper doll ...