worked on 2D/3D raytracing

adjusted BVH
improved 2D/3D BVH
new bounding volumes
new test cases
renamed some test-cases for grouping reasons
made GPC header-only using slight adjustments

geo/Ray2.h

@@ -0,0 +1,29 @@
+#ifndef GEO_RAY2_H
+#define GEO_RAY2_H
+
+
+#include "Point2.h"
+
+struct Ray2 {
+
+	/** starting point */
+	Point2 start;
+
+	/** ray's direction */
+	Point2 dir;
+
+public:
+
+	/** empty */
+	Ray2() : start(), dir() {
+		;
+	}
+
+	/** ctor */
+	Ray2(Point2 start, Point2 dir) : start(start), dir(dir) {
+		;
+	}
+
+};
+
+#endif // GEO_RAY2_H