Bloat the library with shortcuts

[Roland Melkert]

If Roland commits to supporting a meta-command, I personally feel that it is the best solution to the "sticker problem". And as he pointed out above, it could also be used to support wheels and tyres. A single sticker part could even potentially have multiple !ATTACHTO commands (although I'm not sure off-hand if there are any sets where multiple copies of the same sticker get applied to different parts, or different locations on the same part).

I'm willing to add it to 16d, that release is waiting on me to process the 1903 snapping data info anyway.

These new metas are basically snapping info too.