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

geo/Point3.h

@@ -92,6 +92,9 @@ struct Point3 {
 		return std::sqrt(dx*dx + dy*dy + dz*dz);
 	}
 
+	/** get a normalized copy */
+	Point3 normalized() const {return *this / this->length();}
+
 	float length() const {return std::sqrt(x*x + y*y + z*z);}
 
 	float length(const float norm) const {
@@ -109,4 +112,16 @@ private:
 
 };
 
+inline bool dot(const Point3& p1, const Point3& p2) {
+	return p1.x*p2.x + p1.y*p2.y + p1.z*p2.z;
+}
+
+inline Point3 cross(const Point3& a, const Point3& b) {
+	return Point3(
+		a.y*b.z - a.z*b.y,
+		a.z*b.x - a.x*b.z,
+		a.x*b.y - a.y*b.x
+	);
+}
+
 #endif // POINT3_H