Fix menubar macOS

[hacknus]

I noticed that on macOS the menubar is not looking right anymore:

This PR applies some changes, it would further also allow for a "Settings" window to be implemented, if there would be an egui container for that (we would only need to create a new item in app_icons.rs).
The menu bar now looks like this:

TODO:

• I have not yet managed to replicate the separator lines

[emilk]

Wait, what was the problem with the menu bar?

[hacknus]

It always says NSMenuItem instead of the name of the application

[emilk]

Oh, weird! On my macOS Sonoma 14.2.1 it works I get the name of the app:

[hacknus]

That is indeed very interesting! On Venture it also worked for me, but once I updated to Sonoma (currently 14.1.2) I was noticing this error...) I'll update to 14.2.1 and check again.

[hacknus]

I have updated to the latest version of macOS and this has fixed the issue. This is odd indeed...
On the bright side, I now learned how one could implement a "Settings" menu in macOS (cmd + ,) is this something that is planned as an extension for egui? or not really because this would be too platform specific?

[emilk]

Glad to hear it!

It's probably too platform specific too be part of eframe, but it would be good if eframe users could still add it themselves if they want too.