Combine mixins with command creation

[andrewsayre]

Description:

Combine mixins with command creation logic into one set of APIs.

Related issue (if applicable): closes #81

Checklist:

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• Tests have been added/updated. No exclusions in .coveragerc permitted.
• README.MD updated (if necessary)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.74%. Comparing base (1d49cc0) to head (fedca4b).

Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #82      +/-   ##
==========================================
- Coverage   99.76%   99.74%   -0.02%     
==========================================
  Files          19       21       +2     
  Lines        2128     1971     -157     
==========================================
- Hits         2123     1966     -157     
  Misses          5        5              

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