naming clusters + mockup for exports

[mihkal]

please enable baptizing clusters and mockup for export them in pdf/png and svg

It would mean a different table for modularity class -> users can baptize them how they like after that in color options one would have the number with new label

then in export on could define area wher to 'print' the mockup of color clusters

[jukkahuhtamaki]

Naming clusters would indeed be a great option!

[mihkal]

https://twitter.com/mihkal/status/1501895237026865156

an example where this would have been handy

[iosonosempreio]

Thematically related to #2591 (speculations about a better use of modularity classes)