NEW: x11/uxplay

Hi ports --

Attached is a new port, x11/uxplay. UxPlay is an AirPlay-Mirror and
AirPlay-Audio server.

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pkg/DESCR:
UxPlay is an AirPlay-Mirror and AirPlay-Audio server.

UxPlay can emulate a second display for macOS and other AirPlay clients.
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Works perfectly on a very underpowered amd64 Chromebook that I converted
to an OpenBSD machine. I'm able to have the machine act as a second
monitor for my MacBook Pro. Audio works great too.

OK?

~Brian