Block-Edge Issues Sorted

I've worked out all of the block edge related issues. Most of it was solved by the neighbour border copy method, and the remaining ones were fixed by carrying over the step remainder between block rays. The artefacts visible at the moment are because of the crude method I'm converting the dragon, and also his very low resolution. I'm currently sampling him in a virtual block of 256³ voxels, while he's natively closer to 2000³ voxels. I've also implemented proper camera transformation, so now you can move around the dragon and view it from any angle. Next on with the lighting...