Add ClickGroove template with magnets

[dalewking]

I am excited to switch to the ClickGroove style, but I also have bases with magnets and a bunch of magnets to use up. It would be really nice if there were a bin template that combined both ClickGroove and with pockets for magnets. That would let you use them either with magnet bases or ClickGroove bases

[yawkat]

There is an open PR with gridfinity extended: ostat/gridfinity_extended_openscad#273

In the meantime, you can use my fork here: https://gridfinity-extended-fork-yawk-at.pages.dev/gridfinity_basic_cup

It allows combining any gridfinity extended feature (such as magnets) with clickgroove.