dpms: Add support for DPMSInfoNotify event from DPMS 1.2 (xorgproto)

Open Alexander Volkov requested to merge avolkov/xserver:dpms into master

This allows applications to respond to changes of power level of a monitor, e.g. an application may stop rendering and related calculations when the monitor is off.

Related bug: https://bugs.freedesktop.org/57120

Signed-off-by: Alexander Volkov a.volkov@rusbitech.ru

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