WIP: Allow customize dog bone holes

[keymon]

Thank you for this great tooling!

Using this project for some furniture to send the files to a a CNC cutting shop. They will cut the shapes as I send them.

Because that, I do not need to take into account the laser length, that can be 0. But I also need to customize the dog bone size to the given drill size.

This PR does:

• Set a custom dog bone diameter
• Tab dog bone shift is the same than the tab hole
• Set a custom additional shift for X or Y

With the additional X or Y shift, one can effectivelly set different dog bone styles.

Note: This is a draft PR. the feature needs more testing and I only used for interlocking. I am working on this on my free time, so I might take a bit to finish it.

[luzpaz]

bump