Add API for getting left and right wheeldrop

Signed-off-by: Jacob Perron <jacobmperron@gmail.com>

include/create/create.h

@@ -336,6 +336,16 @@ namespace create {
        */
       bool isWheeldrop() const;
 
+      /**
+       * \return true if a left wheeldrop is detected, false otherwise.
+       */
+      bool isLeftWheeldrop() const;
+
+      /**
+       * \return true if a right wheeldrop is detected, false otherwise.
+       */
+      bool isRightWheeldrop() const;
+
       /**
        * \return true if left bumper is pressed, false otherwise.
        */