enable / sleep / reset controls about stepperdriver HOT 4 CLOSED

Something like this was in the early code but I removed it in commit e1f6618. I thought the driver should not control this line anyway (it should be done externally), so other than wrapping the pin in a set of two methods there is little advantage to having it in the class and require another pin and initializer set. But I'm willing to reconsider.

Also, these drivers have two lines for switching off the motor, ~ENBL and ~SLEEP. One is active LOW the other is active HIGH. While most schematics wire ~SLEEP only, I actually prefer ~ENBL because it does not lose the counter position and does not have a charge wait.

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Thanks for you well-written project. I would actually like to have the enable/sleep functionality as well. It is just convenient to have the additional class function. For my project I did add the function to sent the motor to sleep...

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Resolved in #6

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One thought about multi-motor setups such as 2-3 axis controls: the ~ENABLE (or ~SLEEP) control line is shared, so it technically doesn't belong to any particular driver.

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