Function multiply

multiply(a, b, dst?): Vec2
Multiplies a vector by another vector (component-wise); assumes a and b have the same length.
Parameters
- a: Vec2
  Operand vector.
- b: Vec2
  Operand vector.
- Optional dst: Vec2
  vector to hold result. If not passed in a new one is created.
Returns Vec2
The vector of products of entries of a and b.