feat(tracker): add "By Zone + % Complete" sort options

Groups quests by zone with headers, then orders each zone's quests by
completion percent (completes on top / bottom in the reversed variant).

README.md

@@ -1,9 +1,9 @@
 # Questie-X
 
-Fork of [aron-w/Questie-X](https://github.com/aron-w/Questie-X) with bug fixes.
+Fork of [aron-w/Questie-X](https://github.com/aron-w/Questie-X) with bug fixes and personal changes.
 Made for and tested on CoA, but it should also work on other 3.3.5 clients.
 
-## Changes in this fork
+## Fixes
 
 - fixed world map icons offset due to Ascension's objective frame and zoom addons like Magnify.
 - fixed tracker objectives not updating correctly.
@@ -12,6 +12,10 @@ Made for and tested on CoA, but it should also work on other 3.3.5 clients.
 - fixed custom quests not showing (complete) in the tracker.
 - fixed custom quest items not showing.
 
+## Changes
+
+- added "By Zone + %% Completed" and "By Zone + %% Completed (Reversed)" tracker sorting options.
+
 ## Credits
 
 [aron-w/Questie-X](https://github.com/aron-w/Questie-X)<br>