transform = (matrix, connector) => {
  // OPTIMIZE
  const newpoint = vec3.transform(vec3.create(), connector.point, matrix)
  const newaxis = vec3.subtract(
    vec3.create(),
    vec3.transform(vec3.create(), vec3.add(vec3.create(), connector.point, connector.axis), matrix),
    newpoint
  )
  const newnormal = vec3.subtract(
    vec3.create(),
    vec3.transform(vec3.create(), vec3.add(vec3.create(), connector.point, connector.normal), matrix),
    newpoint
  )
  return fromPointAxisNormal(newpoint, newaxis, newnormal)
}
Transform the give connector using the given matrix.
@param {mat4} matrix - a transform matrix
@param {connector} connector - the connector to transform
@returns {connector} a new connector
@alias module:modeling/connectors.transform