BrachioGraph with Pi-Zero Case

Wanted to take the BrachioGraph parts from atomant_ one step further and include an actual case for the Raspberry Pi Zero on the Shoulder Motor Mount. I'm including two versions, one that uses the screw in portion from the original and one that uses the clips from the Pi Zero Case by Nicolinux. The former has a few other changes including a thicker base so the joints don't have as much stress, that improved the print quality for me.

For both of the shoulder motor mounts I increased the size of the holes to 3.5mm from 3mm to more easily fit a bolt thru it.