Parametric bevel gears with easy settings

Thank you GregFrost for designing this parametric Scad, and thank you jimb15122 for modifying it. It is an extremely useful thing. However as a beginner at Scad, I still found it difficult to understand what settings and parameters to modify in order to get the desired gear for the given project. So I made some modifications myself to make it easier to set the parameters. Someone who is also new to scad, might appreciate it.

I also constructed a formula to calculate the circular pitch for a given gear radius. Makes it easier to design gears for applications where the size is crucial.

outside_circular_pitch = 360 * outside_pitch_radius / gear_teeth

note:
Even if the gears in the viewport appear wrong (like they are inside one another) if rendered separately and printed, the teeth will always line up.