refactored ItemViewMode to be part of ViewMode and added the Context enum

src/app/core/shared/context.model.ts

@@ -0,0 +1,11 @@
+/**
+ * This enumeration represents all possible ways of representing a group of objects in the UI
+ */
+
+export enum Context {
+  SearchList = 'searchList',
+  SearchGrid = 'searchGrid',
+  Submission = 'submission',
+  AdminMenuList = 'adminMenuList',
+  SubmissionModal = 'submissionModal',
+}