#270 - Merging type systems breaks consistency

[reckart]

• Post-process merged type system to ensure internal consistency
• Unit test checking for consistency of merged type system
• Auto-format

[codecov[bot]]

Codecov Report

Merging #273 (fe07469) into main (832b8c1) will increase coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #273      +/-   ##
==========================================
+ Coverage   95.35%   95.38%   +0.03%     
==========================================
  Files           5        5              
  Lines        1872     1887      +15     
==========================================
+ Hits         1785     1800      +15     
  Misses         87       87              

Impacted Files	Coverage Δ
cassis/json.py	91.72% <100.00%> (+0.11%)	:arrow_up:
cassis/typesystem.py	95.43% <100.00%> (+0.07%)	:arrow_up:
cassis/xmi.py	96.72% <100.00%> (ø)

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