evdev: switch to a normalized transformation matrix

evdev: switch to a normalized transformation matrix

The big change here is the requirement to have the translation component in a
device-normalized coordinate space. Without that, we cannot reliably rotate as
the coordinate space is effectively unknown and may differ between the axes.
This affects any rotation matrix or translation matrix, pure scale matrices
were working just fine since they're unit-less.

Requiring the matrix in device-normalized space makes it possible for libinput
to rotate or otherwise handle the matrix independent of the screen resolution.
The rotation matrix is documented in a bit more detail to make it easier for
users to figure it out.

This changes the definition of the WL_CALIBRATION property (which is currently
broken).

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>