geometry changes/fixes/new features

new grid walkers + fixes
new test-cases
worked on step/and turn detection
android offline-data-reader
worked on vap-grouping

grid/walk/v2/modules/WalkModule.h

@@ -6,11 +6,11 @@
 /** base-class for all WalkStates */
 struct WalkState {
 
-	/** position where the walk starts */
-	GridPoint startPos;
+	/** current position within the grid (-> in cm!) */
+	GridPoint position;
 
 	/** ctor */
-	WalkState(const GridPoint& startPos) : startPos(startPos) {;}
+	explicit WalkState(const GridPoint& position) : position(position) {;}
 
 };