feat: configuration to hook into XHR Error handling

* Error handling.

* Fix error handling, add redirect example.

* remove debugger

* docs: whitelabeling and httpErrorHandler

* bump dicomweb-client version

* bump cornerstone-wado-image-loader version

* Add more documentation around httpErrorHandler callback

* test: add errorHandler as an expected top level export

Co-authored-by: dannyrb <danny.ri.brown@gmail.com>

platform/viewer/public/config/idc.js

@@ -0,0 +1,19 @@
+window.config = function(props) {
+  var servicesManager = props.servicesManager;
+
+  return {
+    routerBasename: '/',
+    enableGoogleCloudAdapter: true,
+    enableGoogleCloudAdapterUI: false,
+    showStudyList: true,
+    httpErrorHandler: error => {
+      // This is 429 when rejected from the public idc sandbox too often.
+      console.warn(error.status);
+
+      // Could use services manager here to bring up a dialog/modal if needed.
+      console.warn('test, navigate to https://ohif.org/');
+      window.location = 'https://ohif.org/';
+    },
+    healthcareApiEndpoint: 'https://idc-sandbox-002.appspot.com/v1beta1',
+  };
+};