Clarify comment about the use of event.Skip().
Support for multiple wiimotes on OS X.
Fixes issue 3703.
Note that HLE wiimote activation is currently a little broken, so to
use multiple wiimotes you need to open the wiimote configuration window,
refresh (connect to) the real wiimotes, start the emulation and then
select Connect Wiimote 2/3/4 from the Tools menu or with hotkeys.