Activate with this in application_configuration / input :
      "debug": {
        "gadget": "Input_viewDebugJson",
        "type": "object_view",
        "title": "Debug JSON"
      }

expandSchema: Object.create does not clone an object. Also fix a bug deleting properties after copying

This will replace the previous debug widget that shows input & output
wheras we only have one json now

base64 is added for XMLRPC limitation (or bug)