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

tests/geo/TestPoint2.cpp

@@ -0,0 +1,23 @@
+#ifdef WITH_TESTS
+
+#include "../Tests.h"
+#include "../../geo/Point2.h"
+
+TEST(Geo_Point2, math) {
+
+	Point2 p1(1,2);
+	p1 += Point2(2,3);
+	ASSERT_EQ(p1, Point2(3,5));
+
+	Point2 p2 = Point2(-2,-1) + p1;
+	ASSERT_EQ(p2, Point2(1, 4));
+
+	p2 -= Point2(1, 2);
+	ASSERT_EQ(p2, Point2(0,2));
+
+	Point2 p3 = Point2(1,2)*2;
+	ASSERT_EQ(p3, Point2(2,4));
+
+}
+
+#endif