Add a function to the compositor api to send full touch events

Add a function to the compositor api to send full touch events

A simple sendTouchPointEvent(id, x, y, ...) type of function will not
be sufficient in the future due to the amount of data in a touch
event; therefore an additional sendFullTouchEvent is introduced. This
function takes a QTouchEvent and posts a series of down, motion, up,
frame events as needed. In the future it may be changed so that it
maps to a protocol extension instead of the standard events.

As an example qwindow-compositor is updated to use this new function.

Change-Id: I39d3df1c6d4868364440f59789d01fc5b7b80dac
Sanity-Review: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Jørgen Lind <jorgen.lind@nokia.com>