Fix installing latest extra-packages (#280)

Fixes #279

This commit ...

1. strips tag prefix from listed remote tags before sorting
   and re-adds it to resulting tag in order to make sort ... work as expected.
2. raises error 2 if no tag was found.

Fix plugin python version detection

This commit...

1. extends availability checks of plugin_host-3.3 by checking presence
   of plugin host executable in addition to `"disable_plugin_host_3.3"` setting.

2. ignores presence and content of .python-version file if python 3.3
   is not available. Any plugin is running on latest python version then.

Add support for python 3.13

Fix test module imports (#277)

This commit modifies `top_level_dir`, which is used to resolve module names
when loading unittests, to ensure, only modules from specified ST package are
importet.

Without this commit, UnitTesting might attempt to import packages/modules/tests
from Lib/ directory due to possible ambiguities.

Scenario:

Plugins of `MyPackage` are organized in `Packages/MyPackage/dirname/` and tests
in `Packages/MyPackage/dirname/tests/`. If a library `Lib/pythonXX/dirname`
exists, Unittesting would have attempted to import tests from that directory,
because test module paths would have been translated to `dirname.tests` due to
`top_level_dir` pointing to `Packages/MyPackage`.

By adjusting `top_level_dir` to `Packages/`, test module names are translated
to `MyPackage.dirname.tests` instead.

Optionally disable python 3.3 package creation

Python 3.3 plugin_host is optional as of ST4193.

If disabled don't create py33 proxy package as it would otherwise just run on
python 3.8 host likely causing issues.

Reload after coverage initialization (#270)

This commit reloads modules after initializing coverage racing,
 to include package imports into "tested" code results.

Beautify GH action output (#269)

Add comments to each scripts, as first line is what is being displayed
in Github Action output.

Update README

Move scripts into actions directories (#250)

Move scripts into actions directories

This commit moves scripts that drive Github Actions into the related actions
sub directory as the top-level "scripts" folder appears to be somewhat detached.

Version 1.6.1