Map device coordinates onto target surface

The current implementation outputs most touch attributes in device
coordinates. However, the primary use case is to map the input device
onto an area on the screen, needed in particular for multihead setups.
Moreover, the XI2.1 backend works with screen coordinates, creating
an unnecessary discrepancy between backends. This patch adds the basic
transformation layer to the utouch surface, thus serving as the master
point of device-to-surface mapping.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>

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