Added custom overlay to wire colorer
Added custom overlay to wire colorer

Custom overlays, woop
Also cleaned up the code and fixed a few bugs which, strangely, no one
has noticed before (the vector input didn't work, the color output would
stop updating if you aimed it at an invalid entity, etc)

The old timers deserve some love, too

mms92/wire,thegrb93/wire,CaptainPRICE/wire,notcake/wire,wiremod/wire,Grocel/wire,plinkopenguin/wiremod,mitterdoo/wire,NezzKryptic/Wire,Python1320/wire,garrysmodlua/wire,sammyt291/wire,rafradek/wire,dvdvideo1234/wire,immibis/wiremod,bigdogmat/wire