#162 - Handling of Invalid sofa indexes

[reckart]

• Rename offset converter class
• If an offset is invalid according to the mapping strategy, do not map it - pass through as is and log warning
• Added test that invalid offsets are passed through on import and export and that warnings are logged

[codecov[bot]]

Codecov Report

Merging #246 (9d6420b) into main (705da20) will increase coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #246      +/-   ##
==========================================
+ Coverage   95.51%   95.53%   +0.02%     
==========================================
  Files           5        5              
  Lines        1827     1836       +9     
==========================================
+ Hits         1745     1754       +9     
  Misses         82       82              

Impacted Files	Coverage Δ
cassis/cas.py	96.01% <100.00%> (+0.11%)	:arrow_up:
cassis/json.py	91.61% <100.00%> (ø)
cassis/xmi.py	96.88% <100.00%> (ø)

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