Meaningful breakdowns!

Replaces RimWorld's random breakdowns with an actual game mechanic;

All buildings that can break down now require maintenance. If properly maintained, the building will never break down. If not maintained, the chances of breakdown will gradually increase, and a quick breakdown is almost certain when no maintenance is done for prolonged periods of time.

Feedback on how this affects difficulty is more than welcome. Variables I'm particularly in are;

• speed of maintenance decay.
• speed of maintaining job
• chances of breakdowns happening (and should breakdowns still have a tiny chance to happen even if properly maintained?)

Future additions will - maybe - include additional checks and bounds on maintenance; e.g. powered off buildings won't degrade, etc.

Updates:
13.0.1.1:

• intercepted weird double comp save/load bug.