[PR] Machinery EMP Resistance (Wild Singulo Fixes)

[Studenterhue]

Merged/implemented a few hours ago. Mostly a bug-fixing PR, but like the description says, due to the way the fixes are coded, it does make it so turning off APCs makes them immune to battery drain from EMPs and so additional EMPs on an EMP'd camera don't extend how long it's off.

Hopefully, this won't break things like tgui paper have. But do make bug reports if it does and feedback threads if maybe those above shouldn't be.