* Fix 27 (URLs in markdown links)
* Tweak email address recognition
* Add ability to toggle context view
* Cleanup, commenting, add keyboard hints in the header
* Add shortening and toggling shortening of URLs
* Restructure URLChooser for current urwid best practices
* Update tlds list
* Replace AttrWrap (deprecated) with AttrMap
* Highlight selected URL. Fix 17
* Implement 21 (Option to remove duplicate URLs)