broot v1.56.0

• impacted_panel verb argument, allows the effect of a verb to be on another panel (eg to scroll the preview panel without removing the focus from the tree) - Fix #1119
• focus_panel_left and focus_panel_right internals - Fix #1115

Major Feature: merge staged files to issue a single command

When a verb argument has a space-separated or comma-separated flag, a single external command is run even when the selection is multiple.
The default verbs.json file has an example of a zip verb building an archive from all staged files: https://dystroy.org/broot/conf_verbs/#single-command-on-stage
Fix #465