started removing KLib related code:

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

grid/GridPoint.h

@@ -4,7 +4,7 @@
 #include <cmath>
 #include "../geo/Point3.h"
 
-#include <KLib/Assertions.h>
+#include "../Assertions.h"
 
 struct GridPoint {
 
@@ -46,7 +46,7 @@ struct GridPoint {
 
 	/** read-only array access */
 	float operator [] (const int idx) const {
-		_assertBetween(idx, 0, 2, "index out of bounds");
+		Assert::isBetween(idx, 0, 2, "index out of bounds");
 		if (0 == idx)	{return x_cm;}
 		if (1 == idx)	{return y_cm;}
 						{return z_cm;}