Move wl_pointer tests from event-test.c to their own pointer-test.c
file. This move makes the test organization clearer and more consistent,
and will make addition of further pointer tests easier.
Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>