By adding a `sorting_hint` to a menu item, the program will put orphaned items in the relevant (sub)menu instead of in the first menu with a NEW prefix.
Fixes#4393.
* fixes#2898 (prevents accidentally triggering reboot or poweroff)
Add ConfirmBox before reboot/power off
* increases clarity by preventing second page
* add "sleep" menu entry
* Add exit menu hold callback
* Force refresh when kindle is out of screensaver or usb is unpluged.
* Improve AutoFrontlight
* More plugins sub menu
* Last brightness should always be updated
* Finish autofrontlight improvement and enable it by default.
* More tets
* onFlushSettings
* MenuSorter can now correctly sort sub menus
"frontend/ui/menusorter.lua:110:13: value assigned to variable 'sub_menu_content' is unused"
Kind of the point, I'm assigning it nil after all. This way it probably shouldn't complain.
MenuSorter: forgot to add plugin style change
MenuSorter: worked out the final quirks
* Menu always compressed into tables without missing indexes for ipairs compatibility
* Orphans attached
* Separators no longer count as items
