Improve annotation formatting

[ashfaqfarooqui]

The heading structure right now ends up looking like a wall of text, not very easy to get an overall context of the highlights.

It would be nice to organize them according to chapters. So the structure would be:

• Book name
  ** Chapter 1
  highlight 1
  ** Chapter 1
  highlight 2
  ** Chapter 2
  highlight 1
  ...

Plus, the properties drawer can (maybe) have additional information about chapter progress.

[karlicoss]

Yeah makes sense. That's more of a kobuddy issue though, since need to extract
. Also my guess that some books might not have proper chapter structure loaded in Kobo or don't have properly named chapters (e.g. smth like #(34)text/part0015.html). But would be interesting to try, going to require changing code somewhere here and potentially involves ContentID, Title fields from content table.
Perhaps I'll try it over the weekend.