Modify HELMET_COMPAT flag to allow proper use of some headgear.

[zombiethoughts]

Summary

SUMMARY: Bugfixes "modifies HELMET_COMPAT flag to allow use of headgear up to 40 encumbrance"

Purpose of change

Some types of headgear were not allowed to be worn because of HELMET_COMPAT flag being lower than certain headgears encumbrance value.

Mentioned in #29171

Describe the solution

Modified the combined value of current head encumbrance plus encumbrance of item trying to be worn from a maximum of 20 to a maximum of 40.

[zombiethoughts]

This should pass gorgon now. My fingers were being dumb earlier, and I had to fix the summary line multiple times.

[anothersimulacrum]

Jenkins rebuild

[kevingranade]

I really want to enumerate a bunch of the examples that get thrown around about what should and shouldn't fit, and stick em in a test.

[zombiethoughts]

Cool, should I just leave this here, or should we close this since you're working on it?

[Photoloss]

I really want to enumerate a bunch of the examples that get thrown around about what should and shouldn't fit, and stick em in a test.

No idea how many beanie hats you might be able to stretch over your head but the main one would be to fit a skullcap or a tight cloth cap, a mail coif or sleek open-faced helmet and a greathelm on your head in that order, and not suffer stamina loss or similar strain from just walking around. This combination does not need to be viable for prolonged combat however and should in fact drain your stamina pretty quickly if running/fighting during the summer so the great helm should maintain high mouth encumbrance.

I believe most other cases of heavily loaded heads are already covered by the mouth+eyes split and the "strapped" layer and at best need material/flag fixes (e.g. the army helmet is VARSIZE but contains no cotton or leather to represent an adjustable liner). In terms of what shouldn't fit: stacking pretty much any two hard-shell helmets unless one of them is the great helm (or the aforementioned NYI skullcap), wearing "bulky"/rimmed hats or uniform-style caps/berets underneath hard helmets and wearing more than maybe 2-3 of those hats piled on top of one another (you could make a pile of hats but they would no longer cover your actual head at that point, a tight fedora under a large sombrero should be doable). No idea how to handle hoods as a purpose-built one would certainly fit a hardhat or spangenhelm but definitely not the sombrero.