return selected file to termnal and allow user to configure how to open files

[bokunodev]

feature request:

1. add ability to return selected file to terminal by pressing Shift+Enter or Shift+Q.
   this will be very useful for scripting
2. allow user to configure on how to open files. for example using exo-open instead of $EDITOR.

[antonmedv]

1. add ability to return selected file to terminal by pressing Shift+Enter or Shift+Q.
   this will be very useful for scripting

Nice idea.

2. allow user to configure on how to open files. for example using exo-open instead of $EDITOR.

Walk supports WALK_EDITOR.