started removing KLib related code:

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

tests/grid/TestGrid.cpp

@@ -176,7 +176,7 @@ TEST(Grid, neighborIter) {
 	grid.connectBiDir(idx1, idx5);
 
 	int i = 0;
-	for (GP& node : grid.neighbors(idx1)) {++i;}
+	for (GP& node : grid.neighbors(idx1)) { (void) node; ++i; }
 	ASSERT_EQ(4, i);
 
 }