Body temperature regulation is now based on species, and environmental
temperature now respects the air density when affecting living/humans.
This also fixes some bugs with heat/cold protection handling and
improves the way synthetic species body temperatures are handled to be
much more logical.
IPCs always gain temperature but cool down because of their environment.
When the heat transfer to the environment is reduced because of the lack
of air, this will cause IPCs to heat up.
As well, having an infection will increase your body temperature, and
body scanners now detect infections.
...internal damage.
Also removed started_healing() proc because it doesn't actually report
whether the wound is healing and isn't really used for anything.
This fixes the autoheal bug, which was being caused by wound types such
as tiny bruises from being used even for large amounts of damage.
I imagine that relying on the order of the list returned by typesof() is
always a bad idea.
