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.

rtengine/procevents.h

@@ -469,6 +469,7 @@ enum ProcEvent {
     EvcbdlMethod = 439,
     EvRetinexgaintransmission = 440,
     EvLskal = 441,
+    EvOBPCompens = 442,
     NUMOFEVENTS
 
 };