Add an option to disable high-resolution wheel scroll

Starting on libinput 1.19 pointer axis events have been deprecated in
favor of their scroll equivalents, including support for high-resolution
wheel scroll.

While it is recommended to handle the new events, some applications
and/or frameworks might not be ready at the moment.

Provide an option to discard high-resolution wheel scroll events.

Fix #41

Signed-off-by: José Expósito <jose.exposito89@gmail.com>
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