Move visitor random spawners to entity tables + other cleanup

[SnappingOpossum]

About the PR

Changed all instances of RandomSpawner in ShuttleRoles\spawners.yml to EntityTableSpawner.

Why / Balance

Part of #42243, codebase convention.

Technical details

Groups of prototypes moved to group selectors, rare chance moved to a weight with 1 - RareChance being the weight for the other prototype groups where applicable, removed duplicate entries in favour of weights.
Single prototype spawners were moved to implicit EntSelectors
De-indented some sprite layers.
Moved around some parent/name/id fields to fit convention.

Media

Requirements

• I have read and am following the Pull Request and Changelog Guidelines.
• I have added media to this PR or it does not require an in-game showcase.

Breaking changes

Changelog

[IProduceWidgets]

For the ones that are lists and not single Ids, its a little funny to do this and not make them actual tables.

More me musing, because I dunno what maints want to do with them, but every instance of ConditionalSpawner could be done via a table selector and a nullselector within an entitytable. Probably more juice than is worth the squeeze in this case imo, but something to consider for you maints folk ig. The conditionalSpawner feels pretty vestigial, but there is a kind of simple elegance to it.

[SnappingOpossum]

I didn't bother making tables since I didn't see much use for reusing sections or reducing complexity.

I'm not sure all the conditions in ConditionalSpawner are all supported by EntityTableSpawner as is, but it doesn't make a big difference for single items without conditions like here, and if needed I can replace the few conditional anyway.