Add WM_ROLE to windows generated by flameshot

[yggdr]

Feature Description

Currently I cannot easily control which of the windows flameshot opens (like configuration, or the "Pin to desktop"-window) should be set to floating in my i3 configuration. With firefox e.g. I able to filter for window_role="PictureInPicture" to have the video player popup automatically in floating mode. In flameshot, I can only really filter for the entire class='flameshot'.
Adding WM_ROLE to the various windows opened would make this selection more granular.

[mmahmoudian]

I agree that this can be further improved, but at the moment, at least for the windows I tested, it is possible to have granular window rules by using combination of "window class" and "window title":