feat(content): add residential roof chunks and one new residential roof solar variant

[LilShiningMan]

Purpose of change

Making roofs of residences a tiny bit more dynamic by introducing residential roof chunks. These nested chunks will be any sort of scenes/items you might find on a residential roof. I'd like there to be just a little higher chance of finding a surprise on a rooftop, and to hint at life in the game outside of whatever the player is up to.

Describe the solution

Create the Nested Chunk container for residential roof chunks. I've only added 2 variants at the moment (one spawns a frisbee and baseball, the other a couple of crows perching on the roof) for the moment to make this easier to review. In the future I'd like to add more variants, maybe including some enemy spawns that would make sense (any flying or leaping creatures) as well as some loot (if the player is climbing rooftops to escape monsters, other survivors also likely have been as well, some of whom may have left some gear there for safekeeping, and then never came back).

Describe alternatives you've considered

leaving house rooftops to be dull and lifeless

Testing

linted and spawned in game

Additional context

All in all, I think rooftop spawns should be rather rare, and a nice surprise or bonus, rather than something the player consistently does to check if there is anything up there.

NOTE: crows spawn in flight and promptly fly away, but I think this makes sense -- if the player is noisily climbing a rain gutter and then bursts onto a rooftop, that's bound to cause some panic.

I've also added a new residential solar rooftop variant -- a 2x4. I think this will probably be my last variant, as there aren't too many more that make sense for the size, and I doubt we need any more.

Checklist

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