delaying progress dialog based on time
introduce a new function for plugins to self-destruct
threading for search_promisc plugin
threading for scan_poisoner plugin
threading for link_type plugin
automatically refresh plugin list (Gtk)
automatically refresh plugin list (Curses)
Fixed polkit install failure on macOSX
rename plugin_kill to plugin_kill_thread
Merge pull request #427 from koeppea/gtk-progress-delay

delay gtk progress dialog based on time
Merge pull request #431 from koeppea/plugin-threading-2

Threading one-shot plugins
Fixed if statement