#190 - Allow getting the type system from a type

[jcklie]

• [x] Type::supertype is now type instead of str
• [x] New subsumes on Type and deprecate the one on Typesystem
• [x] type in FeatureStructure is now Type
• [x] several predicates such as is_primitive are now available as static functions
• [x] Feature::rangeTypeName -> Feature::rangeType.name
• [x] Feature::elementType -> Feature::elementType.name

[codecov[bot]]

Codecov Report

Merging #191 (a28215c) into main (4fcaf76) will increase coverage by 0.11%. The diff coverage is 96.08%.

@@            Coverage Diff             @@
##             main     #191      +/-   ##
==========================================
+ Coverage   97.38%   97.50%   +0.11%     
==========================================
  Files          12       12              
  Lines        2374     2448      +74     
==========================================
+ Hits         2312     2387      +75     
+ Misses         62       61       -1     

Impacted Files	Coverage Δ
cassis/typesystem.py	95.93% <93.43%> (+0.54%)	:arrow_up:
cassis/cas.py	96.63% <100.00%> (+0.01%)	:arrow_up:
cassis/util.py	95.80% <100.00%> (ø)
cassis/xmi.py	97.70% <100.00%> (+0.01%)	:arrow_up:
tests/test_cas.py	100.00% <100.00%> (ø)
tests/test_typesystem.py	99.38% <100.00%> (+0.02%)	:arrow_up:
tests/test_xmi.py	100.00% <100.00%> (ø)

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