APC cell_type is now an actual power cell type
Reduces supermatter DAMAGE_RATE_LIMIT
Sets RD server freezer to low power and map fixes

Removed some engine bits that got copied into space and forgotten about.
Attempts to fix #6226

Kind of a hack. A proper fix would look at how humans produce heat.
Increases max SMES output to 250 kW

Was recently updated to that on dev so it shouldn't hurt on dev-freeze.
Emergency shutters down have pressure/temperature difference overlays.

Based on the emergency shutter from Paradise.
Fixes several outstanding bugs with new hydroponics.
Fixes most of #6300
Trying to add to previous.
Adds inflatables to EVA storage.