tools: Add a lightboard script to get detailed info from individual HLSL tests.
After running 'make check', this script can be used to see which tests are not passing, showing the test line and a [XP], [XF], or [F] tag, for each backend.
It can be used like this:
python3 lightboard.py [-b] <vkd3d_build_path>/tests/hlsl
So we can say "All lights green across the board" in a cinematic way.