Removes limitation of being unable to join different colors of cable
Allows merging of different kinds of cable
Adjusts the color changing proc to be nicer as per Baystation12/Baystation#11645
Makes several custom color definitions, utilized by the floor painter, floor tiles, decals, etc.
Colored floor turfs now use a white icon state and applies a color, similar to the corresponding decals. This ensures they have the same color tone (was slightly off previously).
Colored floor tiles also use a white icon state and color application.
Removes now unused item states.
Axes speed of light and procs that used it (but were not used by anything). More maths too, and max stack amounts, not used anywhere.
Ticks back stuff that was unticked for faster compile, whoops.
