Merge branch 'devs/devilhorns/atomic'

This merge adds initial support for Atomic Modesetting and Nuclear
Pageflipping. These features require a new kernel (>= 4.8) and have
only been testing on Intel i915 drivers. There are runtime checks in
the code to only enable these features when supported so this should
not break anything for "normal users". For those lucky enough to be
able to use these features, please enjoy the buttery smoothness ;)

@feature