Changes

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* rectangle: add a rectangle object at the current turtle x,y position
 
* rectangle: add a rectangle object at the current turtle x,y position
 
* gear: add a gear object at the current turtle x,y position with the number of teeth as the argument
 
* gear: add a gear object at the current turtle x,y position with the number of teeth as the argument
 +
* gear radius: returns the radius of a gear with the number of teeth as the argument (useful for positioning gears)
 
* motor: add a motor at the current turtle x,y position (attached to the object at this position)
 
* motor: add a motor at the current turtle x,y position (attached to the object at this position)
 
* pin: add a pin at the current turtle x,y position (attached to the object at this position) to prevent movement
 
* pin: add a pin at the current turtle x,y position (attached to the object at this position) to prevent movement