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/TestLength.cpp

@@ -3,7 +3,7 @@
 #include "../Tests.h"
 #include "../../geo/Length.h"
 
-TEST(Length, float) {
+TEST(Geo_Length, float) {
 
 	static constexpr float delta = 0.00001;
 
@@ -24,7 +24,7 @@ TEST(Length, float) {
 
 }
 
-TEST(Length, int) {
+TEST(Geo_Length, int) {
 
 	LengthI l1 = LengthI::m(1.0);
 	ASSERT_EQ(1, l1.m());