[Bug 250795] support RFB 3.3 for VNC client interoperability

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250795

--- Comment #10 from Peter Grehan <grehan at FreeBSD.org> ---
v3 works great and has very snappy mouse-tracking, but the downside is it uses
8.5% host CPU time when the guest is idle, compared to 2.0% for the v2 patch.

I have a modified version of v2 that double the update frequency, but only
updates every 2nd iteration unless there is keyboard/mouse movement detected
from the VNC input stream. This appears to preserve the mouse-tracking
improvements in the v3 patch, but is now down to 2.2% host CPU with an idle
guest.

Will post an updated diff shortly.

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