Added compilerbouw & graphics ass 7: raytracing 2

.gitmodules

compilerbouw

graphics/ass7/Makefile

graphics/ass7/bbox.c

graphics/ass7/bbox.h

graphics/ass7/buddha.scn

graphics/ass7/bvh.c

graphics/ass7/bvh.h

graphics/ass7/constants.h

graphics/ass7/cow.scn

graphics/ass7/intersection.c

graphics/ass7/intersection.h

graphics/ass7/main.c

graphics/ass7/matte.scn

graphics/ass7/perlin.c

graphics/ass7/perlin.h

graphics/ass7/plymodel.c

graphics/ass7/plymodel.h

graphics/ass7/quat.c

graphics/ass7/quat.h