Fix publish workflow - final(TM) fix

[CasperWA]

So it seems the new publish workflow sort of worked - only it didn't actually publish correctly on PyPI.
This was due to the fact that the local checked out version was wrong, and still the original one prior to updating the version, changelog and all.
This fix moves the step, where the tag is force pushed to the newest commit up before the creation of the source distribution and subsequent publishing on PyPI. This will automatically checkout the newly created commit as well.

Also, up the pre-sleep time before "waiting" in the new Action publish workflow to 15 seconds (default is 5 seconds).

This also shaves down the .gitignore file, trying to remove all the unrelevant lines.

[codecov]

Codecov Report

Merging #378 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #378   +/-   ##
=======================================
  Coverage   90.27%   90.27%           
=======================================
  Files          54       54           
  Lines        2386     2386           
=======================================
  Hits         2154     2154           
  Misses        232      232           

Flag	Coverage Δ
#unittests	90.27% <ø> (ø)

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[shyamd]

What happened to the invoke task that actually sets the version?

[CasperWA]

What happened to the invoke task that actually sets the version?

It works fine. It's just that the action makes all the changes and push upstream within a separate Docker container, hence when it leaves the action, we're still on the original checkout of the repository.
So a git fetch is needed, essentially. Which coincides well with force pushing the created tag to the newly created commit (from the Docker container-action).

[shyamd]

Sounds good. Let's try this again. :P