- Rename WRITE_E_STEP for consistency

- Add BIT and TEST macros
- Add _APPLY_ macros to stepper.cpp to help with consolidation
- Consolidate code in stepper.cpp using macros
- Apply standards in stepper.cpp
- Use >= 0 instead of > -1 as a better semantic
- Replace DUAL_Y_CARRIAGE with Y_DUAL_STEPPER_DRIVERS

Marlin/fastio.h

@@ -13,8 +13,7 @@
 */
 
 #ifndef MASK
-/// MASKING- returns \f$2^PIN\f$
-#define MASK(PIN)  (1 << PIN)
+  #define MASK(PIN)  (1 << PIN)
 #endif
 
 /*