The Powernet Crusade

Ports additional powernet changes from /tg/, mainly concerning the SMES, machine processing, and area power updates.

Our APC load balancing is again a victim but the current processing is more release-friendly than my previous attempt. My previous attempt worked fine as long as there was enough power. If not, things got extreme fast.

**Todo**
- [ ] Lights do not currently draw power.
Likely depends on /tg/'s static draw system.
- [x] Solar trackers appear to work now.. maybe. Need to display current star orientation.
Seems to make more sense to check if an object blocks light than simply being dense.