Add missing filters to slot inventories

[David-Goru]

Summary

This PR adds the "Belt" filter and trait and sets up the "Belt" and "IDSlot" filters

I'm not sure if it is expected to add any possible trait/filter that will be used (like for the HeadContainer, which is not in use as far as I can see, but may be in the future). If so, please let me know which containers we'll need to have the filters/traits and I'll gladly set them up!

PR checklist

• The game builds properly without errors.

• No unrelated changes are present.

• No "trash" files are committed.

• Relevant code is documented.

• Update the related GitBook document, or create a new one if needed.

Pictures/Videos)

Belt.and.IDSlot.filters.working.mp4

Testing

Try to drag any item to the BeltContainer - only the Toolbelt should work
Try to drag any item to the ID container - only PDAs/IDs should work

Changes

"Belt" filter has been added to the "BeltContainer" inventory slot (in the Human prefab), and the "Belt" trait has been added to the "Toolbelt" as an starting trait

Also, "IDSlot" filter was already created and the "IDSlot" trait was already in the PDAs/IDs, but the "ID container" inventory slot didn't have the filter attached - so this PR fixes it

Related issues/PRs

Closes #1364

[stilnat]

thanks for the work ! we're good with id and toolbelt for now, but we'll probably have more containers to set up in the future, just need to write it down.