[rebased] Add a color management framework to weston

[Richard Hughes]

I've rebased my cms patches from 1.0.6 to master/1.1.0. Two patches
attached. I've been testing them using gnome-color-manager, but you
can equally do something like:

colormgr device-add-profile
/org/freedesktop/ColorManager/devices/weston_drm_0
/org/freedesktop/ColorManager/profiles/icc_4b416c56cc6c3322a30b6d48548b449f
colormgr device-add-profile
/org/freedesktop/ColorManager/devices/weston_drm_0
/org/freedesktop/ColorManager/profiles/icc_a5bdfcca60078dce523c5acc8d1cbaad

Then, to make the display a test blue color:

colormgr device-make-profile-default
/org/freedesktop/ColorManager/devices/weston_drm_0
/org/freedesktop/ColorManager/profiles/icc_4b416c56cc6c3322a30b6d48548b449f

And to restore the screen back to sRGB with linear gamma ramps:

colormgr device-make-profile-default
/org/freedesktop/ColorManager/devices/weston_drm_0
/org/freedesktop/ColorManager/profiles/icc_a5bdfcca60078dce523c5acc8d1cbaad

Richard.
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