filesystem: add mac os x directory watcher this code is incredibly stinky tbh we should probably be using C++ threads everywhere else just because they are SO much easier to code for than the shitty Qt threads API

// Progress bars

.progress-bar-variant(@color) {
  background-color: @color;

  // Deprecated parent class requirement as of v3.2.0
  .progress-striped & {
    #gradient > .striped();
  }
}