clients: Add screensaver inhibitor client demo

Derive client from simple-shm and hook up the API defined in
wayland-protocols to allow client screensaver inhibition requests.

v5:
  + Add simple-idle client demo
  + Add command line options to delay creation/destruction of inhibitor

Signed-off-by: Bryce Harrington <bryce@osg.samsung.com>
3 files changed