Cleaned up Degree, Radian, AngleAxis and Quaternion classes

Cleaned up Degree, Radian, AngleAxis and Quaternion classes
- Inline Degree, Radian and AngleAxis types to avoid unnecessary exports / export table lookups in using code
- Change AngleAxis to store a Radian angle for better accuracy
- Make Quaternion explicitly take a Radian as constructor

Change-Id: I81f5478572322c65f87045d1b58c621da8989d27