fix/ Karma configuration to debug easily

Keep karma executing in iframe but enable node integration in subframes
Specifying the remote debugging port by default to allow intellij to detect the debuging port

src/karma.conf.js

@@ -30,16 +30,17 @@ module.exports = function (config) {
     customLaunchers: {
       AngularElectron: {
         base: 'Electron',
+        flags: [
+          '--remote-debugging-port=9222'
+        ],
         browserWindowOptions: {
           webPreferences: {
             nodeIntegration: true,
+            nodeIntegrationInSubFrames: true,
             allowRunningInsecureContent: true
           }
         }
       }
-    },
-    client: {
-      useIframe: false
     }
   });
 };