Change semantic equivalence logging

[khdesai]

Generalize semantic equivalence-contributing properties checking functionality within environment.py and add prop_scores dict so all scoring results can be in a single python object.

Current test suite includes tests that do and do not specify a comparison method, so did not add tests at this time. But willing to do so if needed

[codecov-io]

Codecov Report

Merging #304 into stix2.1 will decrease coverage by 0.01%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           stix2.1     #304      +/-   ##
===========================================
- Coverage    98.15%   98.13%   -0.02%     
===========================================
  Files          123      123              
  Lines        13845    13730     -115     
===========================================
- Hits         13589    13474     -115     
  Misses         256      256

Impacted Files	Coverage Δ
stix2/environment.py	100% <100%> (ø)	⬆️
stix2/test/v21/test_environment.py	100% <100%> (ø)	⬆️

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[clenk]

Looks good! As we talked about, just a few things to change:

• Test weights not adding up to 100
• Remove _indicator_checks and fix the 2 tests that use it
• Make sure we have a test for if "method" is provided
• Reshuffle the try/excepts in semantically_equivalent() and adjust warning messages
• Add param to semantically_equivalent() for prop_scores dict
• Update documentation on using the weights dictionary (both with tuples or 'method'), and how to get the detailed results

The documentation piece may go in a separate PR depending on timing.

[clenk]

Thanks, @khdesai! These changes have been merged in.