Extra quaternion functions (DEF-2755)

[subsoap]

Everything that stringray or unity has would be useful http://help.autodesk.com/view/Stingray/ENU/?guid=__lua_ref_obj_stingray_Quaternion_html

For example vmath.quat_to_euler_angles_xyz is something people would use to easily check for min/max pitch and then vmath.quat_from_euler_angles_xyz to convert back.

[britzl]

Internal ticket: https://github.com/defold/defold/issues/3389