Other gear profiles

[skeptonomicon]

For gear or involute_gear, Add cycloidal, triangle, saw tooth, and microgear gear tooth profiles. Cycloidal and microgear tooth profiles are used in clock/watch mechanisms. Saw tooth gears are used in clock/watch escapements. triangle gears are largely historic, i.e. Antikythera mechanism.

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[skeptonomicon]

It seems to make sense to repurpose the unused gear module to do the other tooth profiles. I am thinking the gears module is pretty much moot at this point. It seems to only do a simple mitered or square gear. The involute gear module is fairly large and complex already, so I don't think it is the place for the other profiles.