worked on synthetic sensors

worked on grid-walker
minor changes/fixes/improvements

synthetic/SyntheticWalker.h

@@ -45,7 +45,7 @@ public:
 	}
 
 	/** increment the walk */
-	void tick(const Timestamp timePassed) {
+	Point3 tick(const Timestamp timePassed) {
 
 		// update time
 		this->walkedTime += timePassed;
@@ -61,6 +61,8 @@ public:
 		// inform listener
 		for (Listener* l : listeners) {l->onWalk(walkedTime, walkedDistance, curPosOnPath);}
 
+		return curPosOnPath;
+
 	}