tag and version in `addon.xml` are now matching
`os.getcwd()` deprecation is taken care of in source I wrote.  Better
approach taking `os.curdir`
re-structure repo so that add-on source is separate from the tests.
configuring the code directories so that nose2 can actually run the
tests with the repo restructure
String id's moving to the 30xxx range for plugins.
adding optional, but recommended tags to the addon.xml.

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