rotate
Rotates face to be relative to referenceFace.
Assumes north to be the default direction (i.e. supplying north will result in no rotation)
Think of this like changing the direction of North. For example, if you change North to point where East would be, then suddenly East in your coordinate system becomes South.
Return
The rotated vector
Parameters
face
Must be a horizontal cardinal direction (north, east, south, west)