* Minor changes
* Changed default panel screenshot name
* Removed default visualization type from `addPanel` config
... which, unless defined, will use the app's default (graph). This is the new approach for plugins which supports annotations.
* Select timezone from dashboard toolbar instead of settings
... and refactored `setDashboardTimeRange` for reuse on other pages via a now more generalized `setTimeRange`
* Added optional annotations to `addDashboard` config
* Added `explore` flow
… which reuses `configurePanel` which is very similar
