Annotations, part 1 (#11563)

New format to handle annotations (page bookmarks, highlights, notes) and store them in the book metadata files.

plugins/exporter.koplugin/main.lua

@@ -156,6 +156,7 @@ end
 
 --- Parse and export highlights from the currently opened document.
 function Exporter:exportCurrentNotes()
+    self.ui.annotation:updatePageNumbers()
     local clippings = self:getDocumentClippings()
     self:exportClippings(clippings)
 end