message: launch.json placeholders for testbed grep, fgrep params
diff: "runtimeExecutable": "${workspaceFolder}\\source\\testbed\\node_modules\\.bin\\electron",
  "runtimeArgs": [
  "${workspaceFolder}/source/testbed/node_modules/floss/electron/index.js",
  - "{\"debug\":true, \"noDevTools\":true, \"path\":\"lib/testbed/frontend/index.js\"}",
  + "{\"debug\":true, \"noDevTools\":true, \"path\":\"lib/testbed/frontend/index.js\", \"grep\":\"\", \"fgrep\":\"\"}",
  "--debug-brk=5858",
  "--remote-debugging-port=9223"
  ],
  