A new function to idle the motor after stepping

A new function that allow setting the idle option to power down all the motor coils after stepping, in order to reduce power and heat. That also allows manual rotation of the motor.

Author: fduraibi

src/Stepper.h

@@ -95,6 +95,9 @@ class Stepper {
 
     // mover method:
     void step(int number_of_steps);
+    
+    // Power down all coils after stepping, to reduce heat, power and allow manuall rotation.
+    void idelAfterStep(bool idle);
 
     int version(void);
 
@@ -106,6 +109,7 @@ class Stepper {
     int number_of_steps;      // total number of steps this motor can take
     int pin_count;            // how many pins are in use.
     int step_number;          // which step the motor is on
+    bool idle;                // Power down all coils after done stepping
 
     // motor pin numbers:
     int motor_pin_1;