add quaternion property
add quaternion
Rotation representation with quaternion fix #9510
make it clean
merge cocos
rename _rotation_quat to _rotationQuat
wrong spelling
wrong scale order
bind setRotationQuat
skip Node::set/getRotationQuat
add quaternion test
use std math library M_PI instead of pi.
change light direct for good look.
Merge pull request #9688 from pipu/modify_warning

Modify warning code.
Merge pull request #9611 from super626/quaternion

Rotation With Quaternion