New webPreferences settings for node integration

[Marxsal]

Apparently there have been changes in the recent versions of node, so that webPreferences now needs to be:

 webPreferences: { 
       nodeIntegration: true,
        contextIsolation: false,
        enableRemoteModule: true }

Without this, attempts to use "require" (and probably other bits of the node api) in the browser will fail with message "Uncaught ReferenceError: require is not defined".
(Node 14+)