Add ignore for other IDEs and add ignore for docs/.venv/

[Kureii]

I edit git ignore for other IDEs. This is the first step to add support for cmake build and make the project available to more developers.

[Kureii]

Are you okay with my plan?

[bjorn]

Well, I'm curious what the CMake project would look like.

Note that Qbs can also generate Visual Studio project files (I haven't tested it) and that there is a Qbs extension for VS Code. So I think Qbs is quite available (though not sure about CLion or Xcode).

[bjorn]

I don't see why we would need to ignore pro files again. You're not going to add back a qmake project, are you?

[bjorn]

This should be covered by the existing *.qbs.user* ignore rule, right?

[bjorn]

If we're going to ignore *.user, then a bunch of ignore rules below are not needed.

[bjorn]

Suggested change

	# QT Creator
	# Qt Creator

[bjorn]

Oh, and the commits from #4073 came back. Please rebase instead of merging upstream. :-)

[bjorn]

Hmm, you do need to resolve the conflicts before doing git rebase --continue. Alternatively, if you rebase using git rebase -i upstream/master, then an editor will open where you can drop the changes that were already applied upstream, so you don't need to resolve conflicts in them (by deleting the relevant pick lines).