weston-test: add device_{release/add} into protocol

This request simulates device creation/destruction from evdev (libinput)

v2: added support for touch. Touch is not supported yet,
    but better be prepared

Signed-off-by: Marek Chalupa <mchqwerty@gmail.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
2 files changed