Add Task to Load and Store Operations

[bekwam]

Add an HBox containing a ProgressBar and a Label. These will be bound to Task properties supporting the Tasks for the load and store operations.

The load method should handle both the success and failure causes. This means implementing the ui and the fail functions.

fun load() {  // and store()
  runAsync {
    updateMessage("loading components")
    updateProgress(4.0, 1.0)
    loadComponents()
  } ui {
    updateJavaFXProperties()
  }  fail {
    // show dialog
  }