Split up the touch event into the different touch types

Split up the touch event into the different touch types

Instead of having one touch events representing different types of touch
events by providing a touch type, have one separate event type per touch
type. This means the LIBINPUT_EVENT_TYPE_TOUCH is replaced with
LIBINPUT_EVENT_TYPE_TOUCH_DOWN, LIBINPUT_EVENT_TYPE_TOUCH_MOTION,
LIBINPUT_EVENT_TYPE_TOUCH_UP and LIBINPUT_EVENT_TYPE_TOUCH_CANCEL.

Signed-off-by: Jonas Ådahl <jadahl@gmail.com>