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

data/Timestamp.h

@@ -0,0 +1,66 @@
+#ifndef TIMESTAMP_H
+#define TIMESTAMP_H
+
+/**
+ * helper-class to handle timestamps
+ */
+struct Timestamp {
+
+private:
+
+	/** internal timestamp in milliseconds */
+	int64_t _ms;
+
+	/** HIDDEN ctor. use factory methods */
+	explicit Timestamp(const int64_t ms) : _ms(ms) {;}
+
+public:
+
+	/** empty ctor */
+	explicit Timestamp() : _ms(0) {;}
+
+	/** get timestamp from the given value which represents milliesconds */
+	static inline Timestamp fromMS(const int64_t ms)	{return Timestamp(ms);}
+
+	/** get timestamp from the given value which represents seconds */
+	static inline Timestamp fromSec(const float sec)	{return Timestamp(sec*1000);}
+
+
+public:
+
+	/** get timestamp in milliseconds */
+	inline uint64_t ms() const {return _ms;}
+
+	/** get timestamp in seconds */
+	inline float sec() const {return _ms/1000.0f;}
+
+
+public:
+
+	/** is this timestamp zero? */
+	bool isZero() const {return _ms == 0;}
+
+	/** equal? */
+	bool operator == (const Timestamp& o) const {return _ms == o._ms;}
+
+	/** not equal? */
+	bool operator != (const Timestamp& o) const {return _ms != o._ms;}
+
+	/** smaller than the given one? */
+	bool operator < (const Timestamp& o) const {return _ms < o._ms;}
+
+	/** greater than the given one? */
+	bool operator > (const Timestamp& o) const {return _ms > o._ms;}
+
+
+	Timestamp operator - (const Timestamp& o) const {return Timestamp(_ms - o._ms);}
+
+	Timestamp operator + (const Timestamp& o) const {return Timestamp(_ms + o._ms);}
+
+	/** cast to float */
+	operator float () const {return sec();}
+
+
+};
+
+#endif // TIMESTAMP_H