Added new "Preprocess WB" parameter in the Raw toolpanel, just below "Raw White Points" tool. Allows to choose between "Camera" and "Auto" (average-based) raw channel multipliers, and to apply custom compesation factors.

Fixes #5616

rtgui/toolpanelcoord.h

@@ -59,6 +59,7 @@
 #include "perspective.h"
 #include "pparamschangelistener.h"
 #include "preprocess.h"
+#include "preprocesswb.h"
 #include "profilechangelistener.h"
 #include "prsharpening.h"
 #include "rawcacorrection.h"
@@ -155,6 +156,7 @@ protected:
     FlatField* flatfield;
     RAWCACorr* rawcacorrection;
     RAWExposure* rawexposure;
+    PreprocessWB* preprocessWB;
     BayerRAWExposure* bayerrawexposure;
     XTransRAWExposure* xtransrawexposure;
     FattalToneMapping *fattal;