Calibre - pull files from device (#7492)
Calibre - pull files from device (#7492)

Add a proper implementation of `GET_BOOK_FILE_SEGMENT`, so calibre is now able to pull files from the device.


mwoz123/koreader,Frenzie/koreader,NiLuJe/koreader,NiLuJe/koreader,poire-z/koreader,Frenzie/koreader,poire-z/koreader,koreader/koreader,koreader/koreader