statistic helper classes

test-cases
modified grid importance for better trap-detection

grid/factory/v2/GridNodeImportance.h

@@ -10,6 +10,12 @@ struct GridNodeImportance {
 	/** get the node's nav importance */
 	float getNavImportance() const {return navImportance;}
 
+	/** importance-weight for random walks */
+	float walkImportance;
+
+	/** get the node's random-walk importance */
+	float getWalkImportance() const {return walkImportance;}
+
 	/** ctor */
 	GridNodeImportance() : navImportance(1.0f) {;}