huge commit

- worked on about everything
- grid walker using plugable modules
- wifi models
- new distributions
- worked on geometric data-structures
- added typesafe timestamps
- worked on grid-building
- added sensor-classes
- added sensor analysis (step-detection, turn-detection)
- offline data reader
- many test-cases

grid/GridNode.h

@@ -4,6 +4,8 @@
 #include "GridNodeBBox.h"
 #include "GridPoint.h"
 
+#include <functional>
+
 /** forward decl. */
 template<typename> class Grid;
 
@@ -35,7 +37,8 @@ private:
 
 
 
-
+	static std::vector<std::function<void(std::ostream&)>> serializers;
+	static std::vector<std::function<void(std::istream&)>> deserializers;
 
 
 public: