fix(toolbar): allow customizable toolbar for active viewport and allow active tool to be deactivated via a click (#3608)

Co-authored-by: Joe Boccanfuso <joe.boccanfuso@radicalimaging.com>

platform/docs/docs/platform/services/data/ToolbarService.md

@@ -46,6 +46,8 @@ button is clicked by the user.
 
 - `getActiveTools`: returns the active tool + all the toggled-on tools
 
+- `setDefaultTool`: sets the default tool that will be activated whenever the primary tool is deactivated without activating another/different tool
+
 ## State
 
 ToolBarService has an internal state that gets updated per tool interaction and

platform/docs/docs/platform/services/ui/viewport-grid-service.md

@@ -33,6 +33,7 @@ is expected to support, [check out it's interface in `@ohif/core`][interface]
 | `getNumViewportPanes()`                                               | Gets the number of visible viewport panes           |
 | `getLayoutOptionsFromState(gridState)`                                | Utility method that produces a `ViewportLayoutOptions` based on the passed in state|
 | `getActiveViewportId()`                                | Returns the viewport Id of the active viewport in the grid|
+| `getActiveViewportOptionByKey(key)`                             | Gets the specified viewport option field (key) for the active viewport |
 
 ## Implementations