code: function ActivateDetector (name) {
    let d = GetMotionDetector(name)
    if (d) d.activate()
    else throw new Error(`'${name}' does not exist.`)
  }
docs: Activates an existing detector by name.
  Fails hard (throws an Error) if a {MotionDetector} with that name is not found at the runtime.
  @param {string} name is the name of the {MotionDetector} to deactivate.
  @public