main: add system tray icon

[jpk68]

Adds a tray icon that can be used to (un)minimize the main window. Also includes a Quit option to close the app from the tray.

TODO:

• macOS fixes
• Test on Windows

Resolves #4205
Resolves #2038
Resolves #3316

[selsta]

I don't think this solves all the linked issues, the common request is a system tray for the daemon running in the background when the GUI quit, which as far as I can tell is not solved by this PR, but I did not compile it yet.

[jpk68]

I don't think this solves all the linked issues, the common request is a system tray for the daemon running in the background when the GUI quit, which as far as I can tell is not solved by this PR, but I did not compile it yet.

Apologies, I should probably remove some of the linked issues. AFAIK it does not solve that problem.

[selsta]

It also does not seem to solve the other issues since the common request is for the app to basically hide from the task bar, which is not what minimized does. This might be solvable with setting it to Window.Hidden, but I did not try this yet.

https://doc.qt.io/qt-6/qwindow.html#Visibility-enum

[jpk68]

It also does not seem to solve the other issues since the common request is for the app to basically hide from the task bar, which is not what minimized does. This might be solvable with setting it to Window.Hidden, but I did not try this yet.

https://doc.qt.io/qt-6/qwindow.html#Visibility-enum

Fixed; this should work now.

[plowsof]

is this for windows only?

[jpk68]

is this for windows only?

No, it should be cross-platform. It works as expected on KDE as well.