[CR] Inconsistent damage color coding of vehicle parts, fixed.

Always thought the different color codes was a bug, so I made this.
Uses the same damage color codes for everything "vehicle" related.
Since there were two sets of damage color-codes, I wasn't entirely sure which one to use.
We may want to tweak or add values.
Left the no-longer-used table in commented form, for now.
See getDurabilityColor in veh_interact.cpp for current codes.