Update evac shelters and bring them (mostly) up to code

[I-am-Erk]

Summary

SUMMARY: Content "Updates evac shelter loot supplies, adds a bunch of new aspects, and adds toilets"

Purpose of change

Although understocked by lore, the evac shelters remain one of the most obvious examples of where our loot tables are woefully underrepresented. They don't even have toilets.

Describe the solution

• Adds toilets to the basements of evac shelters
• Changes item spawning to use SUS (specific use storage) itemgroups for the lockers, cabinets, and new sinks in the shelter. These furnitures now contain a much larger selection of items including first aid kits, fire extinguishers, radios, batteries, flashlights, cleaning supplies, and bottled water.
• Adds two new items: a pamphlet from FEMA briefly and uselessly describing the purpose of the shelter and what to do in it, and a terrible tasting protein bar with a humorous backstory.

Also updates the shelter_2 map very significantly, to make it more feasible to put a faction base in there. That was actually my goal with this PR, but as usual I got sidetracked.

Describe alternatives you've considered

This is going to have a major impact on early game difficulty. I would like to balance it a bit by making a 'vandalized' variant of each shelter, with much less loot and graffiti all over the place. NPC looters should also have a major impact on it since they should all know these are places to go for good early-game loot.

Testing

Not yet.

New evac shelter layout

New basement

Stocked up, mostly with junk

Our much more inept version of FEMA loves you and just wants you to be happy.

[Lamandus]

is it intended, that flashlights are missing any batteries? Like there is none in the evec-shelters?
Wouldn't it be better for them to be preloaded with these?

[I-am-Erk]

It wasn't intended, but I don't think it is out of line. On the next pass I'll add a chance for batteries to spawn separately in the lockers, but it won't be high