Icons

[quincylvania]

Currently, the icon files referenced by presets are only located in the iD repo, which is sort of janky. I'd like to see about improving this situation.

[matkoniecz]

Seems solved now? See https://github.com/ideditor/schema-builder/blob/main/ICONS.md

[tyrasd]

This was recently also discussed on #278 (comment) (and other comments in the issue)