Attributes GH PR #883: https://github.com/ArcticaProject/nx-libs/pull/883

XlibAtom should be used wherever remote atoms are handled. This is
important as Xlib data types and server data types of the same name do
not always have identical sizes.

See also https://lists.freedesktop.org/archives/xorg-devel/2015-August/047245.html

Attributes GH PR #869: https://github.com/ArcticaProject/nx-libs/pull/869