Add more cmdline args.
Add more cmdline args.

- -o/--obtext for changing the "Cancel" button text.
- -a/--action for specifying what program to open if user clicks the action button.

sheagcraig/yo,aiiye/yo,aiiye/yo,sheagcraig/yo,applideveloper/yo,sheagcraig/yo,applideveloper/yo,applideveloper/yo