xwayland branch rebase

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