Adding a setting for cornerstone default image renderer

Packages/ohif-cornerstone/client/index.js

@@ -1,4 +1,5 @@
 import { OHIF } from '../namespace';
+import './renderer.js';
 
 import { MetadataProvider } from './lib/classes/MetadataProvider';
-OHIF.cornerstone.metadataProvider = new MetadataProvider();
+OHIF.cornerstone.metadataProvider = new MetadataProvider();

Packages/ohif-cornerstone/client/renderer.js

@@ -0,0 +1,4 @@
+import { Meteor, OHIF } from '../namespace';
+
+const rendererPath = 'settings.public.ui.cornerstoneRenderer';
+OHIF.cornerstone.renderer = OHIF.utils.ObjectPath.get(Meteor, rendererPath) || '';