urlselect: rewrite, lel
Merge branch 'new-urlselect'
urlselect: highlights, notification, and more

- added support for navigating into URLs that contain highlights
- added status notification when certain actions occur
- added help text inside bar
- options++
- more info on `/help urlselect`
- added `list-commands` action
- bind 2 custom commands by default
- set the default bar position on top
- removed `insert` action. it's easily done using custom command. no
  need for special action