Add test environment without any extras installed

[sk1p]

Updates to ensure everything outside the udf module can actually be used without installing the full LiberTEM dependency.

TODO

• refactor code not to import libertem directly
  • in base
  • in common
  • in the tests (other than those in tests/udf/)
• verify the fixture changes that make libertem optional

Contributor Checklist:

• I have added myself to the creators.json file
• I have added a changelog entry for my contribution
• I have added/updated documentation for all user-facing changes
• I have added/updated test cases

[codecov]

Codecov Report

Attention: Patch coverage is 87.11111% with 29 lines in your changes are missing coverage. Please review.

Project coverage is 86.59%. Comparing base (58b58af) to head (e90dc94).

Files	Patch %	Lines
src/libertem_blobfinder/base/masks.py	89.75%	13 Missing and 4 partials ⚠️
src/libertem_blobfinder/base/utils.py	80.00%	5 Missing and 5 partials ⚠️
src/libertem_blobfinder/common/fullmatch.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
+ Coverage   86.56%   86.59%   +0.03%     
==========================================
  Files          12       14       +2     
  Lines         960     1179     +219     
  Branches      135      165      +30     
==========================================
+ Hits          831     1021     +190     
- Misses         85      105      +20     
- Partials       44       53       +9     

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[sk1p]

@uellue @matbryan52 this is the CI addition mentioned in #61 - let me know your thoughts on this, and also feel free to take over the PR

[matbryan52]

@uellue @matbryan52 this is the CI addition mentioned in #61 - let me know your thoughts on this, and also feel free to take over the PR

Thanks for getting this started, I'll see if I can get it into a working state.

[matbryan52]

I've ported the necessary bits of code to make tox pass. The caveat at the moment is that I had to skip the doctests on the base-only testenv. Also will need to port the documentation of masks here too and solve the merge conflicts.

[matbryan52]

I removed the common extras group as it no longer makes sense after these changes. If needed it could be retained as an empty group for backwards compatibility?

[sk1p]

I removed the common extras group as it no longer makes sense after these changes. If needed it could be retained as an empty group for backwards compatibility?

I don't really think it is important to be kept, as long as we mention it in the changelog (and update the install docs)

[sk1p]

@matbryan52 thank you for taking over!

Should the examples also be updated to replace their usage of libertem.masks / libertem.utils, to make them consistent with the rest of the code? Added a small comment inline, other than that, it looks good to me!

[sk1p]

@matbryan52 thanks for finishing this, I'll go ahead and merge!