Hex Shank Bit Holder - Parametric

I've modified the scad file from "Fitzterra" to add more customization and powerfull features, that adds:

* More shapes (Triangle and square)
* Custom size and shapes per row and cols
* Label per hole
* Allow allen key slots
* Global tolerance for holes
* More aesthetics

All holders i generate (I like them bulky), will post them here, so check the variants i put:

* 8x2 Hex Shank with Slot for allen keys.
* 6 Hex Shank + 6 Round bits with Slot for allen keys.
* WoodBits: 8 Hex Sha