function getPresetsDir() {
  // load path from settings
  let options = Options()
  let presetsLibraryPath = options[OPTIONS.PRESETS_LIBRARY_PATH]

  // if no path is set, use default
  if (!presetsLibraryPath) {
    presetsLibraryPath = getDefaultPresetsDir()
  }

  return presetsLibraryPath
}
Returns the path to the presets dir.

@returns {String}