fix: power armor actually benefits from advanced UPS efficiency, adjust efficiency ratio

[chaosvolt]

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Purpose of change

This fixes a flaw I found with the advanced UPS not gaining any benefit when used with light power armor like it does for other items, and along the way I ended up deciding to make the efficiency multiplier used elsewhere by advanced UPS a little neater.

On further testing it was found that this mainly applies to power draw values that demand an odd number of charges, which is why light power armor was most strongly affected by this. @KheirFerrum provided a proper fix for that that compensates for odd-number charge consumption when using advanced UPS.

Fixes #3765

Describe the solution

1. In bionics.cpp. converted use of advanced UPS in Character::consume_remote_fuel to consume 0.5x charges when using advanced UPS, instead of a janky 0.6x.
2. In character.cpp, added a more graceful handling of advanced UPS handling in Character::use_charges, provided by Kheir. Basically, because it's being fed a raw int for how much power it needs to consume from the UPS, it can't gracefully handle cutting the power draw in half in those cases, and that's quite a big difference considering with UPS use each charge is a full kilojoule. Kheir's function checks if the power draw would be an odd number and applies a reduction 50% of the time so that net behavior over a long period of time will match expected results you'd get if power draw was an even number.
3. In character_turn.cpp, converted relevant multipliers in Character::process_items as well.
4. In ranged.cpp, set ranged::gunmode_checks_weapon to defined adv_ups_drain as half that of ups_drain
5. In visitable.cpp, set visitable<inventory>::charges_of and visitable<Character>::charges_of to use new multiplier for advanced UPS.

Describe alternatives you've considered

Banging the code against a rock until every single power-related function and all battery JSON has been converted to properly deal in joules instead of kJ. We'll probably have to suffer than someday anyway if we ever JSONize UPS items...

Testing

1. Compiled and load-tested.
2. Spawned in as a power armor soldier.
3. Tested a full set of light power armor (0.75+0.25 kW, total 1 kW). Power draw after 5 minutes was 297 (average 300) for standard UPS, 161 (average 150) for advanced UPS.
4. Tested medium power armor minus helmet (1.5 kW). Power draw after 5 minutes was 297 (average 300) for standard UPS, 161 (average 150) for advanced UPS.
5. Temporarily set heavy power armor's suit to draw 3 kW on its own (normally 2.25 kW) and tested. Power draw after 5 minutes was 900 (average 900) for standard UPS, 444 (average 450) for advanced UPS.
6. Spawned in a V29 laser pistol, tried firing it without any UPS and confirmed it asks for 10 UPS or 5 advanced UPS charges.
7. Fired it with advanced UPS in inventory, confirmed it uses 5 charges as expected.
8. Checked affected files for astyle.

Power draw is weird and random, so exact matches to expected average aren't as important as confirming the difference exists.

Comparison of UPS items after 5 minutes of light power armor+helm use each:

Modified 3-kW heavy power armor test results:

Laser pistol message:

Additional context

At some point I want to unhardcode UPS items outright which will mean a JSONized efficiency rating for each item, which means the current hacks will likely need to be replaced with something that can handle it better. That might even require an outright overhaul of power draw code, use_charges_if_avail, or more to behave more sanely, I don't know.

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[chaosvolt]

Okay, it should work. By all right it should now ONLY be touching bits of code specific to advanced UPS.

But now all of a sudden the regular UPS is drawing about half as much power as it should be too!?

[chaosvolt]

And thanks to Kheir for figuring out the problems, it seems to work now. Will re-mark as ready after I finish updating the PR OP.