MM+, manifest+, attributions, and more

We can make a thread to keep the MM+ discussion seperate if you'd like

Yes

It is

For reference, the properties of RelatedPackage

Not yet, but eventually it might

Version 12+

But you should probably add support for the format used by core

I guess so

We might want to add it to the M+ documentation even if it's not technically M+

authors, packs, languages, relationships