Improve mask preview and avoid reprocessing when switching spot

Changes:
- Mask preview has been improved. It only applies on detailed image now
("dcrop" pipeline) which corrects unexpected behavior on navigator
image. Mask preview now only applies on selected spot: when switching
between spots, mask preview is deactivated on newly selected spot.
- Image reprocessing is now avoided when switching between spots (except
if mask preview was previously activated). Mask background update
remains functionnal.

Bugfixe:
- AStyle runned on several modified files

rtengine/rtengine.h

@@ -370,8 +370,14 @@ public:
 class LocallabListener
 {
 public:
+    struct locallabRef {
+        double huer;
+        double lumar;
+        double chromar;
+    };
+
     virtual ~LocallabListener() = default;
-    virtual void refChanged (double huer, double lumar, double chromar) = 0;
+    virtual void refChanged(const std::vector<locallabRef> &ref, int selspot) = 0;
 };
 
 class AutoColorTonListener