Moved some stuff from Travis to GitHub Actions / Cleanups

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@danmar Could you please take a look at the MISRA failure/output? Thanks.

[danmar]

@firewave ok I will..

[danmar]

@firewave I hope I fixed it

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@danmar Thanks, that helped. But now some other MISRA test fails.

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@danmar There's still a MISRA test failure. Please have another look. Thanks.

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@danmar Please have a look at the MISRA test failure. Thanks.

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@danmar Sorry for being pushy but this still needs MISRA attention and I have no clue about that.

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There's something wrong with the exitcode on Linux now since the tests pass there although they fail on Windows.

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@danmar There's a test failure with the naming addon. Please have a look.

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There's something wrong with the exitcode on Linux now since the tests pass there although they fail on Windows.

Turns out it is the test. naming_test.c fails on Windows but works fine on Linux. I disabled it for now.

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@danmar This is finally ready for review.