Fix incorrect sampled L*a*b* values

Use LCMS to convert values back into L*a*b*. The pipette buffer has the
output or working profile applied with LCMS. Performing the inverse
operation fixes the incorrect values shown in the navigator, histogram
indicator bars, and lockable color pickers.

rtgui/lockablecolorpicker.h

@@ -24,6 +24,18 @@
 
 class CropWindow;
 
+namespace rtengine
+{
+
+namespace procparams
+{
+
+class ColorManagementParams;
+
+}
+
+}
+
 class LockablePickerToolListener
 {
 public:
@@ -60,8 +72,7 @@ private:
     rtengine::Coord position;  // Coordinate in image space
     rtengine::Coord anchorOffset;
     Size size;
-    Glib::ustring *outputProfile;
-    Glib::ustring *workingProfile;
+    rtengine::procparams::ColorManagementParams *color_management_params;
     Validity validity;
     float r, g, b;  // red green blue in [0;1] range
     float rpreview, gpreview, bpreview;
@@ -72,7 +83,7 @@ private:
 
 public:
 
-    LockableColorPicker (CropWindow* cropWindow, Glib::ustring *oProfile, Glib::ustring *wProfile);
+    LockableColorPicker (CropWindow* cropWindow, rtengine::procparams::ColorManagementParams *color_management_params);
 
     void draw (const Cairo::RefPtr<Cairo::Context> &cr);