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Add EDR event and request

Vitaly Prosyak requested to merge vitalyp/wayland-protocols:color into color 
The extended dynamic range value describes how much dynamic range is available 
    relative to the reference white. A value of 1.0 means that the display can not
    display anything brighter than reference white.
A value of 3.0 means that the reference white is at one-third of the
highest luminance the display can produce, for example, EDR equals to 3.0
means 240 nits, if SDR is 80 nits.
The value in the event is the EDR value multiplied by 1000.
The initial value is equal to EDID luminance divided by 80 nits,
for example, 400 nits monitor has an initial EDR value of 5.0 x 1000.
If EDID does not have luminance then it is equal to 1.0
Edited by Vitaly Prosyak

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