Any symbols (including class properties) that should be visible
outside the module it's defined in need to be defined as global.
For now gjs still allows the access for 'const', but get rid of
the warnings spill now by changing it.
https://bugzilla.gnome.org/show_bug.cgi?id=785084
* switch to a one-column layout (and adjust strings/widths
accordingly
* remove separator before system menu
* add link to account settings to user submenu for consistency
https://bugzilla.gnome.org/show_bug.cgi?id=751377
If airplane mode is enabled with an HW switch, we can't turn it
off from the menu, so make the menu item insensitive and
replace it with a helpful tip.
https://bugzilla.gnome.org/show_bug.cgi?id=709685