Continue to implement GUI. Refs #10227.
Refs #10227.  Added some features.

Including:
1. Automatic counts resolution adjustment;
2. Showing error message;

On branch feature/10227_gui_filter_events
Changes to be committed:

      modified:   MainWindow.ui
      modified:   Ui_MainWindow.py
      modified:   eventFilterGUI.py
Merge branch 'feature/10227_gui_filter_events' into develop