Replace Asserter with module-level assertion functions

[bartfeenstra]

No description provided.

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 93.26923% with 21 lines in your changes missing coverage. Please review.

Project coverage is 95.71%. Comparing base (643047d) to head (84abd84).
Report is 311 commits behind head on 0.4.x.

Files with missing lines	Patch %	Lines
betty/serde/load.py	89.82%	11 Missing and 6 partials ⚠️
betty/tests/test_config.py	33.33%	2 Missing ⚠️
betty/app/__init__.py	0.00%	1 Missing ⚠️
betty/tests/app/test___init__.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            0.4.x    #1606      +/-   ##
==========================================
+ Coverage   95.69%   95.71%   +0.01%     
==========================================
  Files         198      198              
  Lines       18823    18770      -53     
  Branches     3569     3569              
==========================================
- Hits        18013    17965      -48     
+ Misses        550      546       -4     
+ Partials      260      259       -1     

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