[xrandr] Add --brightness for CRTC

[Matthias Hopf]

On Oct 25, 09 03:41:05 +0600, Mikhail Gusarov wrote:
> --brightness n.m adjusts gamma set for CRTC in order to compensate
> for overly bright or overly dark unmanageable outputs.

Looks reasonable. Committed.

Thanks

Matthias

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