Add support for signals

[Djedouas]

All pyqt signals are now typed as such

[Djedouas]

I ran into a problem when connecting QMenu().aboutToShow() signal :
projectMenu.aboutToShow.connect(self.controller.saveSettings)

Which creates a mypy error:
news_view.py:93:9: error: "Callable[[], None]" has no attribute "connect"

So I decided to patch all others signals in QtWidgets.pyi, like it was already done for QAbstractButton

[The-Compiler]

Did you automate this in some way? Why only QtWidgets.pyi?

[Djedouas]

It's handmade. That's why it's only QtWidgets.pyi.
Therefore it can not be considered completely exhaustive, like before.

[stlehmann]

Thanks for your effort of manually adding the signals. I know that's a tedious work. I would like to have a way to automate this stuff. Thanks again :)

[Djedouas]

Thanks a lot!
Happy to participate ;-)