Day 135: New / old scene

In a few days I'll be presenting the engine at my university, so I need to add a few scenes just to show a few features of the engine. So I've reimplemented an old scene with lots of cubes, with a few differences due to the new features of the engine.
While I was doing this I fixed a bad bug that was affecting lights when shadows were disabled. I also fixed for good the bug that yesterday I claimed to have solved, but there were other uninitialized variables that were still causing it.