Introducting soft-proofing and Black Point Compensation, simplify the

CMM at the end of the pipeline + sparse code refactoring
A new BPC checkbutton has been created in 'Preferences/Color Management'
and in the ICM tool. Better hanbling of widget sensitivity of the output
profile / gamma part of the ICM tool.

rtgui/paramsedited.h

@@ -544,6 +544,7 @@ public:
     bool working;
     bool output;
     bool outputIntent;
+    bool outputBPC;
     bool gamma;
     bool gampos;
     bool slpos;