message: Don't overuse relative paths
diff: #include <cstddef>
  -#include <visionaray/math/plane.h>
  -#include <visionaray/math/sphere.h>
  -#include <visionaray/math/triangle.h>
  +#include "math/plane.h"
  +#include "math/sphere.h"
  +#include "math/triangle.h"
  -#include <visionaray/tags.h>
  +#include "tags.h"
  namespace visionaray
  {
  