Convert enums to Qt6 style

[oscargus]

Description of Changes

In Qt6 the enums are no longer located directly under QtCore.Qt. This is fully compatible with Qt5, so a small step towards easier Qt6 support.

This would convert most of them (probably some are still missing).

I went with separate commits to make it easier to review, but let me know if it is preferred to squash them.

(I do not understand what happened with scripts/spyder.bat. I did my best to revert the "change" locally, but for unknown reasons, my git client thought that it was modified...)

• Wrote at least one-line docstrings (for any new functions)
• Added unit test(s) covering the changes (if testable)

• Included a screenshot or animation (if affecting the UI, see Licecap)

Issue(s) Resolved

Affirmation

By submitting this Pull Request or typing my (user)name below,
I affirm the Developer Certificate of Origin
with respect to all commits and content included in this PR,
and understand I am releasing the same under Spyder's MIT (Expat) license.

I certify the above statement is true and correct:
oscargus/Oscar Gustafsson

[oscargus]

I realize that I should have kept external-deps out of it... Problem with automatic search and replace...

I guess the easiest way is to revert those files and squash the commits. Maybe that isn't much of a difference as it is a quite hefty review anyway...

[ccordoba12]

Hey @oscargus, thanks for your contribution. However, I think this is handled automatically by QtPy, right @dalthviz?

[dalthviz]

Checking I think QtPy should be taking care of this with the enums promotion to allow unscoped access even with PyQt6 at https://github.com/spyder-ide/qtpy/blob/a94438f50942c23031776d8698883661eeb8e954/qtpy/QtCore.py#L70-L75

Thinking, maybe this be related with spyder-ide/qtpy#364 ? From what I have been able to check seems like PyQt6 is the only binding that dropped support for unscoped enum access. Maybe @oscargus do you have more info about the state of that or after which version the Qt6/PySide6 projects will be dropping support for unscoped enums access?