Function rotateZ

rotateZ(m, angleInRadians, dst?): Mat4
Rotates the given 4-by-4 matrix around the z-axis by the given angle.
Parameters
- m: Mat4
  The matrix.
- angleInRadians: number
  The angle by which to rotate (in radians).
- Optional dst: Mat4
  matrix to hold result. If not passed a new one is created.
Returns Mat4
The rotated matrix.