Removed update_values(). RIP, shine on you CPU diamond.
Removed get_moles_by_id and get_archived_moles_by_id, all moles are now accessed directly to reduce call cost.
Added set_temperature and set_volume procs which recalc pressure when temperature or pressure change.
Heat_capacity is now a var updated when gases update.
Modified adjust_gas to use set_gas, modified set_gas to alter heat_capacity, total_moles, and pressure as needed.
Moved gas_mixture gas numbers to a list which is connected to a global gas_datum list, like with reagents.
Modified some maths procs to be more sane, added adjust_gas and set_gas to help with processing.
Added a modular system for gas flags - gases can now be marked as fuel and oxidiser with a flag, logged with a flag, scanned with a flag, etc.
Changed scrubbers to use a list of scrubbing gases rather than a set of vars.
Made miners and xenoarch effects more sensible - they now produce gas by ID, not manually.
Made turfs' starting gases into a list, removed turf gas number vars.
Fixes#3517, apparently the stat() for spacepod cells checked that the battery has an object of type cell within it. But since spacepods typecast their cell for specific initialization of a high power cell, the istype(S.battery) check fails if you placed a different type of cell into it. Causing it to instead display no cell detected.
The drop_item arg is now the loc placed, not the child of the loc or whatever.
Removed a few lines of items being placed into themselves, on themselves, into other things manually, into their users, etc.
Cleans up the fix for MoMMI recharger silliness.
This took about 2 hours of non-stop manual searches.
Added damage to spacepods as well as damage overlays.
Started a framework to allow more than 1 weapon system per spacepod.
Pods turn into fireworks when they reach 0 integrity.
