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

serverClientCutProperty is the external equivalent of the internal
clientCutProperty. We need it on the server side, too, because we use
the property on the serverWindow on the real X server. We could
(mis)use serverCutProperty here but this might introduce race
conditions when both sides request selections simultaneously.

Because of validateString being a macro NameForAtom was called twice most of the time.

Fix that by making validateString a function.

Fixes ArticaProject/nx-libs#357

Per-file copyright notices: Update copyright information in file headers that NoMachine placed there own copyright statement in.

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