enhanced Vector3

- improved debug logging
- added Vector3.zero
- added Vector3.one
- added Vector3.clamp()
- added Vector3.clampv()
- added Vector3.clampX()
- added Vector3.clampY()
- added Vector3.clampZ()
- added Vector3.lerp()
- added Vector3.lerpv()
- added Vector3.lerpX()
- added Vector3.lerpY()
- added Vector3.lerpZ()
- added Vector3.cross()
- added Vector3.distanceToSq()
- added Vector3.distanceTo()
- added Vector3.fromArray()
- added Vector3.toArray()
update commentary