createScreenCapture using Screencast DBUS API on Wayland

[Alexander Zvegintsev]

Hi all,

As was requested at the last meeting, I've just published a changeset 
that introduces screen capture using the Screencast DBUS API on Wayland.
It is available for testing and preliminary review.


https://github.com/openjdk/wakefield/pull/5 - code changes

https://github.com/openjdk/wakefield/pull/4 - documentation 
changes(applies on top of code changes)


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Thanks,
Alexander.