AWV-1: Adding navigation of display sets

OHIFViewer/client/components/toolbarSection/toolbarSection.js

@@ -92,6 +92,22 @@ Template.toolbarSection.helpers({
             iconClasses: 'fa fa-undo'
         });
 
+        buttonData.push({
+            id: 'previousDisplaySet',
+            title: 'Previous',
+            classes: 'imageViewerCommand',
+            buttonTemplateName: 'displaySetNavigation',
+            isPrevious: true
+        });
+
+        buttonData.push({
+            id: 'nextDisplaySet',
+            title: 'Next',
+            classes: 'imageViewerCommand',
+            buttonTemplateName: 'displaySetNavigation',
+            isPrevious: false
+        });
+
         buttonData.push({
             id: 'toggleCinePlay',
             title: 'Toggle CINE Play',