LT-259 New proactive UI (three options) for unsaved changes dialog + New API for unsaved changes module (now handlers can be attached to unsaved changes namespace) + Save measurements integration.

Packages/ohif-core/client/ui/dialog/unsavedChangesDialog.js

@@ -0,0 +1,14 @@
+import { Template } from 'meteor/templating';
+import { Blaze } from 'meteor/blaze';
+import { _ } from 'meteor/underscore';
+import { OHIF } from 'meteor/ohif:core';
+
+OHIF.ui.unsavedChangesDialog = function(callback, options) {
+
+    // Render the dialog with the given template passing the promise object and callbacks
+    const templateData = _.extend({}, options, {
+        callback: callback
+    });
+    Blaze.renderWithData(Template.unsavedChangesDialog, templateData, document.body);
+
+};