0.0.8 with steep-angle 8-way renders

This minor update to 0.0.7 adds 8-way renders at a more-top-down angle, almost 45 degrees, with something like an oblique perspective. It does change the colors used, and tends to be brighter and a little more washed-out in the "normal voxel" renders than the "sloped voxel" ones. It does this mainly to improve the appearance of outlines, which seemed much too dark in 0.0.7. I may change color handling in the future to use the same technique for cube and sloped voxel styles.