Add keyboard shortcuts for scaling, allow loading files recursively

[adivardi]

This PR adds keyboard shortcuts for increasing/decreasing bbox scale (length, width, height).
I extended the documentation to reflect this change.

It also includes a small change to load pointcloud files recursively.

[ch-sa]

Hi @adivardi,

thanks for suggesting the PR.

You propose a lot of changes in bulk. The change about adding the scaling shortcuts look good to me. Also replacing the , and . shortcuts is fine with me.

I am only more conservative about breaking the other shortcuts since people might got used to it.
I suggest you split this PR into adding the scaling and recursive point cloud lookup, which we can quickly merge and the remaining changes, which we can then discuss 1 by 1 in a second PR.

For the remaining changes, I would like to end up with a solution that does not break QWERTZ keyboard layouts.
They acknowledge the issue here for PyQt but seem to not offer a solution (besides standard keys).

[adivardi]

@ch-sa
Thanks for the super quick review. I renamed the var as requested and left one comment.

[ch-sa]

• black formatting
• check tests

[adivardi]

@ch-sa
It seems the black version used in CI is the latest (24.4.1), and is different than the one in the requirements file.
I updated the file and ran black on all files, I hope the tests would pass now.

[adivardi]

@ch-sa
I fixed the mypy warnings.

Just a suggestion, wouldn't it be easier to run the workflow before the approval?

[ch-sa]

Yes, but I manually need to approve pipelines to run on every change ...

[adivardi]

Finally all tests passed 😄

[ch-sa]

Merged :)