test: Move all the reference images to their own directory

With over two thousand references images now, it is starting to make the
test directory look cluttered!

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 0 insertions, 0 deletions

diff --git a/test/reference/line-width-scale.quartz.ref.png b/test/reference/line-width-scale.quartz.ref.png
new file mode 100644
index 00000000..afdc9da7
--- /dev/null
+++ b/test/reference/line-width-scale.quartz.ref.png