Switch from menubar to headerbar with primary menu
AisleRiot is the only GNOME game that uses a traditional menubar.
I believe we can retain all the important features if we switch to a headerbar with a primary menu. See https://gitlab.gnome.org/GNOME/Initiatives/wikis/App-Menu-Retirement for some generic design guidance.
I think it would be useful to users (and help simplify) if we did 2 things first: