DM Screen Smaller Gaps

I really liked the DM Screen feasel1 made, but I had a couple minor issues with it. First, I didn't like how big the gaps were between the panels. Second, once it is assembled, there's no taking it apart again because the pins are glued. I've replaced the pins with properly sized screws. Third, the side rails are very hard to attach as-is in the original. I modified those to have an extra surface touching the corner pieces between the two prongs in the original side, top, and bottom rails. The side and bottom rails fit snugly rather than needing to be carefully clamped for gluing.

Please do take a look at the [original screen](https://www.thingiverse.com/thing:3566786) and the [video](https://www.youtube.com/watch?v=_ZkCUwaAjD0) which inspired it.

Note that the interior corners are now different because they overlap. You will want to make sure that corner hinge 1 connects to corner hinge 2 for the top and bottom of your screen during assembly.

The initiative trackers in the picture