Shift to tree view for bookmarks

Cleanup

TODO

@@ -78,7 +78,8 @@ TODO
             Limit the extra files produced by KindleUnpack
                 Have them save to memory
         ✓ fb2 support
-            Images need to show up in their placeholders
+            ✓ Images need to show up in their placeholders
+        djvu support
     Other:
         ✓ Define every widget in code
     Bugs:
@@ -86,6 +87,9 @@ TODO
         Clean up 'switch' page layout
         Colors aren't loaded properly for annotation previews
         Cover page shouldn't be scolled midway
+        Docks
+            Fullscreening should keep dock visible
+            Closing a book keeps dock show button clicked
 
     Secondary:
         Graphical themes
@@ -99,7 +103,7 @@ TODO
         Use embedded fonts + CSS
         Scrolling: Smooth / By Line
         Shift to logging instead of print statements
-        txt, doc, chm, djvu support
+        txt, doc, chm support
         Include icons for filetype emblems
         Comic view modes
             Continuous paging