This is conceptionally similar to a pkgbase, but for groups.
Something like this doesn't really exist on the PKGBUILD level,
but end users can't really work with pkgbase with pacman either,
so for them that doesn't matter.
It still gives the end user the same structure as with packages,
there is a base thing that has multiple instances for each environment,
and searching might be a bit easier.
The UX could be improved, but the basics are there at least.
Fixes#47
