Customisable Tab size

[phillipthelen]

Currently the tabs have a fixed size of 15.85mm deep and 42mm width (if not set to full width). When generating bins that have 1x1 trays, the tabs take up a lot of the surface area making it harder to reach into the bin. For using slimmer labels, this could be changed to a customisable variable to save filament and make smaller trays more open.

If people agree this would be a useful setting to have, I can work on implementing it. Since it already is a static variable in standard.scad, it shouldn't be too hard making a custom option.