Parametric MTG cube / draft tray

This is a remix of the cube tray allowing to freely define most important parameters like
- number of sections
- size of sections (defined in number of cards in each of sections individually)

The shape on the top of section dividers can be:
- a tab (for easier inserting the cards)
- or a cutout (for easier pull out of the cards)
From my testing Tab is much more convenient as you can always pull the cards from the sides.

There are some additional settings for side cutouts (for easier pull out from the cube storage box)

Use JSON file for example data for regular draft (3x15) as well as commander draft (3x20).