* done
* code review
* change arm and hand to "armHorizontal/armVertical" and "handHorizontal/
handVertical"
* change method "getArmHorizontalDist" to "getArmHorizontalDisplacement"
* done
* code review
* change arm and hand to "armHorizontal/armVertical" and "handHorizontal/
handVertical"
* change method "getArmHorizontalDist" to "getArmHorizontalDisplacement"