Avoid Color shift - Gamut and Munsell Review in RT - branch Munsellgamut (#6673)

* Fixed numerous problems with gamut and Munsell in Local adjustments

* change gamut-munsell in lab adjustmnts - gamut in ciecam

* Improve XYZ colorimetry and tooltip

* Change event - format code - change labels tooltips

* Removed avoid_ and avoidmun_

* Removed avoidcolorshift in labcurve

* Push change proposed by Lawrence37 - compatibility with old pp3

rtengine/procparams.h

@@ -376,7 +376,7 @@ struct LCurveParams {
     int     brightness;
     int     contrast;
     int     chromaticity;
-    bool    avoidcolorshift;
+    Glib::ustring gamutmunselmethod;
     double  rstprotection;
     bool    lcredsk;
 
@@ -1019,6 +1019,8 @@ struct LocallabParams {
         int structexclu;
         double struc;
         Glib::ustring shapeMethod; // IND, SYM, INDSL, SYMSL
+        Glib::ustring avoidgamutMethod; // NONE, LAB, XYZ
+		
         std::vector<int> loc; // For ellipse/rectangle: {locX, locXL, locY, locYT}
         int centerX;
         int centerY;
@@ -1038,8 +1040,6 @@ struct LocallabParams {
         double transitgrad;
         bool hishow;
         bool activ;
-        bool avoid;
-        bool avoidmun;
         bool blwh;
         bool recurs;
         bool laplac;