Made cables use color var instead of separate icons for each color.
It allows for wires of ANY color (just set cable_coil var)
and most importantly
40 837 958 b - before
39 506 651 b - after
Moved cable definition to cable.dm because what the fuck.
Merge branch 'dev' of https://github.com/Baystation12/Baystation12 into color

Conflicts:
	code/modules/power/cable.dm
	icons/obj/power_cond_red.dmi
Merge pull request #4314 from comma/color

Non-hardcoded(sprited?) colors for wiring