Editor: preserve captures accross movements
Editor: keep last selection as last when sorting

sort selections 'circularly', keeping the last one
at the end of the list.
Editor: add a ReplaceLast select mode
alt-n replace last selection with next match
Highlight last selection differently
Update README
refactoring selectors
Fix captures preservation in Editor
tweak errjump command
Add a nop command to avoid accidental shell output evaluation
tweak kakrc highlighting