Support packages that span multiple directories

[eltoder]

I extracted this from #228 since it is unrelated to the rest of the changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (bd1b80c) to head (06f2683).

❗ Current head 06f2683 differs from pull request most recent head 462dc95. Consider uploading reports for the commit 462dc95 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #230   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines          509       506    -3     
  Branches       106       106           
=========================================
- Hits           509       506    -3     

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[ariebovenberg]

@eltoder excellent work. After you rebase this branch, I can get to merging it.

[ariebovenberg]

let's see what the 'update branch' button does

...ah...a merge 😒

let's see if I can undo this while not screwing everything up...

[ariebovenberg]

👀 did we just both rebase and force push? Anyways it looks like the commits are in order in the end 😄

[ariebovenberg]

Looks good 👍

[eltoder]

@ariebovenberg looks like we did :)

[ariebovenberg]

@eltoder any other related features you have planned? If not, I'll bundle your improvements into a new release

[eltoder]

@ariebovenberg That's it for now. Thank you for merging!

[ariebovenberg]

@eltoder thanks for your contribution 🤝

[ariebovenberg]

Release 0.19.0 is out now with the improved functionality 🚀