Easy Bake Gear Generator

I wiped up a gear generator based on the MCAD 'involute_gears.scad' libarary
Hopefully, this makes creating gears very easy since all you have to do is plug in some numbers and press F6.

Options include:
- recessed sides (single or double sided)
- gear hub (single or double sided)
- set screw in the gear hub
- relief holes

UPDATE: V0.76
Added options for double set screws and setting the distance for the set screw from the end of the hub.
Renamed everything.
Add