Support other projects than ansible-core and Ansible collections

[felixfontein]

This adds basic support for other projects than ansible-core and Ansible collections. Right now you have to create changelogs/config.yaml manually, and make sure that it contains is_other_project: true. Besides that, the basic functionality seems to work.

Eventually fixes #59.

[codecov]

Codecov Report

Merging #60 (b0d9f9b) into main (026405e) will increase coverage by 0.40%.
The diff coverage is 93.75%.

@@            Coverage Diff             @@
##             main      #60      +/-   ##
==========================================
+ Coverage   88.11%   88.52%   +0.40%     
==========================================
  Files          16       16              
  Lines        1978     2021      +43     
  Branches      491      501      +10     
==========================================
+ Hits         1743     1789      +46     
+ Misses        145      143       -2     
+ Partials       90       89       -1     

Impacted Files	Coverage Δ
antsibull_changelog/changes.py	85.58% <ø> (ø)
antsibull_changelog/config.py	95.86% <89.18%> (-0.37%)	⬇️
antsibull_changelog/cli.py	74.54% <94.73%> (+2.09%)	⬆️
antsibull_changelog/logger.py	100.00% <100.00%> (ø)
antsibull_changelog/plugins.py	93.87% <100.00%> (+0.09%)	⬆️
antsibull_changelog/utils.py	79.59% <100.00%> (ø)
antsibull_changelog/changelog_generator.py	92.12% <0.00%> (+0.92%)	⬆️

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[felixfontein]

I think this is ready as a first usable version.

[felixfontein]

If nobody complains, I'll merge this and release a new version by the end of this week.

[felixfontein]

@jimi-c thanks for your comments!