broot v0.11.6

• backspace was previously bound to :back if not consumed by input. This is removed
• fix unsignificative event interpreted as previous event repetition
• fix wrong background applied on sizes in tree display
• allow env vars used in verb execution to contain parameters (fix #114)
• allow the use of arrow keys as triggers for verbs (fix #121)
• fix scroll adjustement when using the arrow keys (when there's a scrollbar) (fix #112)