Function setAxis

setAxis(m, v, axis, dst?): Mat3
Sets an axis of a 3x3 matrix as a vector with 2 entries
Parameters
- m: Mat3
  The matrix.
- v: Vec2
  the axis vector
- axis: number
  The axis 0 = x, 1 = y;
- Optional dst: Mat3
  The matrix to set. If not passed a new one is created.
Returns Mat3
The matrix with axis set.