Update protocol docs

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Add a wacom_send_and_wait helper function

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Don't request resolution / max coordinates on models which don't support this

And fill in the resulution on some more models (taken from wcmSerial.c).

Signed-off-by: Hans de Goede <hdegoede@redhat.com>