started removing KLib related code:

- assertions
- distributions
new helper methods
worked on stairs
worked on grid-walkers
worked on navigation

floorplan/Stair.h

@@ -13,6 +13,13 @@ struct Stair {
 	/** the direction to move all the starting points to */
 	Point2 dir;
 
+
+	/** empty ctor */
+	Stair() : start(), dir() {;}
+
+	/** ctor with starting edge and stair-direction */
+	Stair(const Line2& start, const Point2& dir) : start(start), dir(dir) {;}
+
 };
 
 #endif // STAIR_H