Plugins like fzopen have the capability to pick files.
This comes handy if nnn is executing as a file picker.
This is a 2-way communication:
- nnn sends the picker output file to plugin ("-" for stdout)
- the plugin tells nnn if it has overwritten the output file
* nuke: use macOS open when GUI enabled
* nuke: use is_mac function to test for macOS
This is consistent with how the imgur plugin does detection.
* Add macOS open command to plugins
* pskill: only execute if input is non-empty