Abc-classroom

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- Default template_repos dir rather than assignment_repos (lwasser, 327)
- Overhaul fixtures, support moving different type of files & fix codecov ci (lwasser, 273, 172)
- Modify how we generate an access token for GitHub API access due to upcoming deprecation of username + password authentication (kcranston, 328)
- Make new repositories use 'main' instead of 'master' as the default branch (kcranston, 326)
- Fix manged abc-quickstart success message (kcranston, 367)
- Refactor the main-to-master branch renaming for better error handling and usability (kcranston, 363)

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- Moving to github actions in this release as well (lwasser)
- Move clone into a stand alone package function (lwasser, 319)
- Add fixtures to conftest for universal abc setup (lwasser, 316)
- Fix CI to force mac to build on python 3.8 and fix linux matrix / tox versions (lwasser, 303)

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- Update the default config to use ``classroom_roster.csv`` which is the default GH classroom filename (lwasser, 297)
- Setup windows testing using github actions (lwasser, 300)
- Add ``scrub`` argument to abc-feedback to clean hidden tests from html (lwasser, 290, 238)

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- Add files_to_ignore to skip moving certain files (lwasser, 172, 278)
- Clone dir copies assignments into an assignment-name dir rather than cloned
dir root (lwasser, 276)
- Fix manifest file to bundle example-data not example-files dir (lwasser, 272 take two)

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- Update manifest to bundle ``example-data`` directory (lwasser, 272)
- This patch also includes an extensive reorganization of the documentation.
There is no GitHub issue associated with this effort. (lwasser)

--------

- Copy / create extra files from an ``extra_files`` directory rather than having
them specified in config (kcranston, 195)
- Changed markdown documents to ``.rst`` to remove ``m2r`` as a dependency
(nkorinek, 210)
- NOTE - there was a package bundling issue in 0.1.0-0.1.3 that was resolved in
this release