Release 2.1.0
Add new DatetimeSelector widget
For wt.apps.BaseApp, adjust drawnow locations and add progress indicators to disable interactivity during load/save/new session.
Change some internal property attributes to enable access for unit tests
Add metadata for future use
For wt.abstract.BaseWidget, add protected requestUpdate method to trigger update method. For R2021a and up, this will improve performance as the update will not occur immediately and will wait for the next drawnow cycle