OHIF-285/OHIF-274: Fix default hanging of display sets into the ViewportGrid (#1917)

* OHIF-285/OHIF-274: Fix default hanging of display sets into the ViewportGrid

Co-authored-by: James A. Petts <jamesapetts@gmail.com>

platform/ui/index.js

@@ -23,6 +23,9 @@ export {
   ViewportGridContext,
   ViewportGridProvider,
   useViewportGrid,
+  HangingProtocolContext,
+  HangingProtocolProvider,
+  useHangingProtocol,
 } from './src/contextProviders';
 
 /** COMPONENTS */