Re-pipes the station using the new overlapping supply/scrubber pipes

Pipes pulled through maintenance where possible, intentionally making them more busy.
No pipes under walls where at all avoidable.
Xeno/Virology "scrubber" pipes now have their own color.

It's a big.. commit >_>

General guidelines that I followed. Not necessarily good guidelines, but guidelines none the less.
* No pipes through walls.
* As much piping through maintenance as possible, mainly to make the tunnels look busy.
* Pipes for a given department should pass through the relevant substations first (added later)