A process scheduler thing

Created by: clusterfack

Included: -The process lists use |= instead of += due to the increased stability of the former against double additions.

-Atmospherics machinery is moved under the pipenet processing.

-Modified the atmospherics processes to return 1 when theyve done something, and 0 if they aint done jack shit. Then called scheck() if they return 1, possibly reducing unnecessary scheck calls while still managing to smooth out the atmospherics processing.

-If a powernet happens to get rebuilt by either powernets or power machinery scheck() is also called