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/TestBBox3.cpp

@@ -0,0 +1,18 @@
+#ifdef WITH_TESTS
+
+#include "../Tests.h"
+
+#include "../../geo/BBox3.h"
+
+TEST(Geo_BBox3, noIntersect) {
+
+	BBox3 bb1(Point3(0,0,0), Point3(1,1,1));
+	BBox3 bb2(Point3(1,1,1), Point3(2,3,4));
+
+	BBox3 joined = BBox3::join(bb1, bb2);
+	ASSERT_EQ(Point3(2,3,4), joined.getMax());
+	ASSERT_EQ(Point3(0,0,0), joined.getMin());
+
+}
+
+#endif