- Add a toggle in Font settings> allowing showing font
ordered by most recently selected (long-press on
it allows clearing this history).
- Keep in G_reader_settings a list of known fonts, so
we can notice newly added user fonts, and put them
at the start of the most recently selected. Show
these new fonts with a symbol in the menu.
- TouchMenu: allows for a flag to trigger menu
refresh when going up.
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