feat: long-press back button on MainMenu to delete a book with confirmation

[illiaboyko]

This is a small feature borrowed from crosspoint; it lets you long-press a book title for 800ms to enter a deletion dialogue. The "Microreader" header turns into "Delete?" and book title turns into "Back=No Sel=Yes " instructions. If confirmed it deletes both EPUB and MRB from library.
As someone who reads a lot of articles on the device I found it quite handy, hope it works for more people.

[CidVonHighwind]

I dont have anything agains that feature but I am not sure how to integrate it in a sensible way. Here are the problems I have with the current implementation:

• books now open on button release, feels worse (small problem)
• the opening button can lead you to accidentally deleting the book you wanted to read
• the ui is pretty strange I would say
• reindexing on delete shouldnt be needed, it should just be possible to remove the one entry without the need to rescan everything.

[illiaboyko]

fair enough!
will take a look at it over the weekend :)

[pablohc]

Thank you very much for this idea, @illiaboyko. Based on this need, I've implemented it in my fork https://github.com/pablohc/microreader/tree/feat/delete-file

[illiaboyko]

ah, lovely job @pablohc, thanks a lot!

i'm not a developer at all, but if you or any contributors/maintainers ever get around to wifi implementation, i would be happy to help with the web ui if needed
all the best!

[pablohc]

@illiaboyko improvement submitted to upstream: #41