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/Point3.h

@@ -1,5 +1,5 @@
-#ifndef POINT3_H
-#define POINT3_H
+#ifndef GEO_POINT3_H
+#define GEO_POINT3_H
 
 #include "../Assertions.h"
 #include <cmath>
@@ -128,4 +128,4 @@ inline Point3 cross(const Point3 a, const Point3 b) {
 	);
 }
 
-#endif // POINT3_H
+#endif // GEO_POINT3_H