xwayland branch rebase

[Kristian Høgsberg]

Hi,

Just a heads up that I've rebased the xwayland branch in the xserver
repo to be based on the 1.5.0 release.  Also, I tracked down the core
problem with the xrandr weirdness - wayland sends out the refresh rate
in mHz, which we passed to CVT as Hz... With that fixed, xrandr now
reports correct modes and geometry and GTK3 X apps, among others work
correctly (eg, popups actually show up).

Kristian