Only allow deletion of empty menu sections #5
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This partially addresses #4 - it prevents the worst-case scenario of accidentally deleting the entire games or emulators menu section. Deleting a section is still possible, but you have to individually delete all of it's links first (or edit from a PC, I suppose...)
Tested on a Powkiddy V90.
I have some other changes in mind, but I'm not sure if I'll get to them today or not. This is safe to merge in as is, though.