Jorim Jaggi f056e35a34 Implement intermediate brigthness control on header.
This just reuses the views from BrigthnessDialog. Later, we will move
to a model where we only have one single slider.

Change-Id: Ib8116741802b7de930331648e50ff55fc869d7af
2014-05-12 15:10:13 +02:00
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