Use hm modules to install extra packages

[pagusupu]

Would be nice for hm modules to install packages required for plugins, for example right now despite me enabling the starship plugin and having starship enabled through the nixos module, I still need to install the starship package separately.

This will also likely be required for future plugins, like how exifaudio requires the exiftool package and optionally the mediainfo package.

[haennes]

This is a "bug", it´s the exact reason why #9 was merged.
Sadly I currently don´t have time to fix this. But feel free to open a PR.
@lordkekz how should we handle plugins setting home-manager options?
In this case just setting programs.starship.enable would be the way to go.
Should we put setting hm-options behind

• a global enable / disable
• a local enable / disable
• both? (toplevel acting as default)
• just use mkDefault
• global + mkDefault

I think that in any of the above cases the assignment should always use lib.mkDefault to grant the user an easy ability to still override