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

tests/math/TestInterpolator.cpp

@@ -1,5 +1,6 @@
 #ifdef WITH_TESTS
 
+#include <cmath>
 #include "../Tests.h"
 #include "../../math/Interpolator.h"