UPS devices preference external sources of power

[Relgar]

UPS devices preference external sources of power

[chaosvolt]

I think the solution I mused upon in that PR might be good:

1. Add two new item flags: UPS_COMPATIBLE_OFF and UPS_COMPATIBLE_ON
2. Change UPS charging code so that it also charges items with the UPS_COMPATIBLE_ON flag.
3. Replace the current UPS flag on all mundane appliances (i.e. stuff that's implied to only use UPS because they're meant to be things you can plug in to charge) with UPS_COMPATIBLE_OFF.
4. Code in a use_action that brings up a menu filtering for items with either of the new flags, and set it so making a selection toggles between the two flags.
5. Add this new use action to UPS and advanced UPS.

[scarf005]

related: #1605

[chaosvolt]

I went a slightly different route in the form of a use action on the devices themselves, but: #4775