Another Magic The Gathering (MTG) deck box/card tray

I got the inspiration from lgilmon's [MTG Deck Box](https://www.thingiverse.com/thing:3061451), and tried to create a similar in openscad:

The box can be used as card tray:
- It have magnets in the side, and on the top to keep it together. (the four d=5x2 magnets is enough, can lift the full deck without fall the bottom)
- It have background graphics inside the tray

In the scad you can customize:
- card sizes (if you use protector and/or use larger deck
- magnets size
- wall thickne