* modify overlay service to accept bottomBarButtons option, working annotate on snapshot view
* working blocking message
* move blocking message to overlay service
* return dismiss function on show
* added jsdocs for overlayService
* added progress bar, with setter and getter functions
* make reviewer requested changes
* re-overhaul of overlayAPI
* Integrate work in dialog-service-vue-style
- Markup in DialogComponent and OverlayComponent now up to date;
- Colors, constants;
- Notebook entry now passes correct buttons config;
- New bg data URIs added;
- u-icon-bg-* classes added to global.scss;
* Added deprecation comments to .vue files
* Removed styles from deprecated file
* Temp restore of CSS so that dialog doesn't break.
* remove old OverlayService
* Fixed to overlay CSS
- Fixed large, small, fit sizes;
- Added margin to overlay buttons;
- Code cleanup;
* Remove unused constants
* Tweak styles for __close-button
* Code cleanup
* small cleanup
* wip progressDialog
* Progress bar fixed and Vue-ized
- Markup, styles;
- Constants moved from theme files into _constants.scss;
* added jsdocs to new Overlay API
* remove unused example function
* use progressBar.vue in NotificationBanner.vue, wire up the maximize method with progressDialog and Dialog from OverlayAPI
* Styling in progress for status message banners
* openmct members are camelCase
* Remove unimplemented/unused apis
