Migration to Github Actions

[thatsIch]

I assume the integration to GitHub is better than to the original appveyor integration.

[thatsIch]

https://docs.rainmeter.net/manual/installing-rainmeter/#SilentInstallation

This might also be interessting or installing with WinGet

https://docs.rainmeter.net/manual/installing-rainmeter/#WinGetInstallation

[thatsIch]

Seems UnitTesting was pulled into SublimeText itself!

SublimeText/UnitTesting#171

[thatsIch]

The tests are failing probably because the UnitTesting framework changed.
But the workflow works in general.

[thatsIch]

That is somewhat frustrating when setting everything up with Sublime Text 4 and seeing that the UnitTesting framework supporting it, but not for python 3.8 which Sublime Text 4113_x64 uses?!

SublimeText/UnitTesting#174