Add initial color management framework code

ICC profiles can now be specified in weston.ini for each output, or a CMS
implementation can optionally loaded from a pluggable module.
diff --git a/weston.ini b/weston.ini
index cd34044..49ba526 100644
--- a/weston.ini
+++ b/weston.ini
@@ -1,5 +1,5 @@
 [core]
-#modules=desktop-shell.so,xwayland.so
+#modules=desktop-shell.so,xwayland.so,cms-static.so
 
 [shell]
 background-image=/usr/share/backgrounds/gnome/Aqua.jpg
@@ -46,6 +46,7 @@
 #name=LVDS1
 #mode=1680x1050
 #transform=90
+#icc_profile=/usr/share/color/icc/colord/Bluish.icc
 
 #[output]
 #name=VGA1