Various changes in Locallab GUI

- Modified some Locallab tool default parameters
- Updates some labels
- Expanders visibility state is now kept when using history
- New added tool has now its visibily state resetted to default one
- Code cleanup

rtengine/procparams.cc

@@ -3394,7 +3394,7 @@ LocallabParams::LocallabSpot::LocallabSpot() :
     wavgradl(false),
     wavcompre(false),
     origlc(false),
-    localcontMethod("wav"),
+    localcontMethod("loc"),
     localedgMethod("thr"),
     localneiMethod("low"),
     locwavcurve{