These were moved to their own trait and removed from the definition of
a Real number. This allows the definition of a trigonometric function
to call a different libc trig function depending on type.
This complete what is needed for the definition of Vector2, Vector3, and Vector4.
This required a trigonometry section, fleshing out the rest of the Number, ToNumber,
and FromNumber section, correctly defining all the available function for the Real
trait, and defining several constants.
