Fix visualization, fix human obstacles

Make visualization of LocalPlanner a ScopedClient so the layers are removed automatically when the navigator is stopped.

Fix proxemic zone generation and visualization of proxemic zones.

source/armarx/navigation/human/ProxemicZoneCreator.h

@@ -38,7 +38,9 @@ namespace armarx::navigation::human
             float personalRadius = 1000;
 
             float movementInfluence = 1;
-            // in the coordinate system of the human
+            // an offset applied to the personal zone in the coordinate system of the human
+            // a positive x-value means an offset to the right
+            // a positive y-value means an offset to the front
             Eigen::Vector2f offset{100, 150};
         };