Pipette and "On Preview Widgets" branch. See issue 227

The pipette part is already working quite nice but need to be finished. The widgets part needs more work...

rtdata/images/Light/index.theme

@@ -0,0 +1,42 @@
+[Icon Theme]
+Name=RawTherapee-Light
+Comment=Light theme for RawTherapee
+Inherits=hicolor
+Example=folder
+
+Directories=actions,apps,categories,devices,emblems,places,status
+
+[actions]
+Size=22
+Context=Actions
+Type=Fixed
+
+[apps]
+Size=22
+Context=Applications
+Type=Fixed
+
+[categories]
+Size=22
+Context=Categories
+Type=Fixed
+
+[devices]
+Size=22
+Context=Devices
+Type=Fixed
+
+[emblems]
+Size=22
+Context=Emblems
+Type=Fixed
+
+[places]
+Size=22
+Context=Places
+Type=Fixed
+
+[status]
+Size=22
+Context=Status
+Type=Fixed