[WIP, DON'T MERGE] Update automatic versioning

[rickecon]

This PR:

• Adds the following files for automatic versioning, .github/changelog_template.md, .github/get-changelog-diff.sh, .github/has-functional-changes.sh, .github/is-version-number-acceptable.sh, .github/publish-git-tag.sh, ``
• Adds "Check version" job to build_and_test.yml GH Action.
• Renames code formatting GH Action from check_black.yml to check_format.yml and updated the actions within.
• Adds "Update versioning, tag, and release steps to publish_to_pypi.yml GH Action on push to master branch. (This does not currently work. Need to fix the release step.
• Adds three new functions to Makefile
• Adds starting changelog.yaml.
• Updates contributor_guide.md.
• Updates README.md.
• Removes hard reference to version number in ./ogcore/__init__.py so that the version reference automatically updates.

cc: @jdebacker

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.12%. Comparing base (4ea91c9) to head (25ae97d).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #940   +/-   ##
=======================================
  Coverage   70.12%   70.12%           
=======================================
  Files          20       20           
  Lines        5047     5048    +1     
=======================================
+ Hits         3539     3540    +1     
  Misses       1508     1508           

Flag	Coverage Δ
unittests	70.12% <100.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
ogcore/__init__.py	100.00% <100.00%> (ø)