[Feature Request]: Update electron to shut down TA on MacOS shutdown/restart

[josephdadams]

What feature would you like to see added to TallyArbiter?

A user has reported that when they shut down their Mac, TA prevents the shutdown process.

We should add a listener and shut it down.

https://stackoverflow.com/questions/51804259/how-to-prevent-electron-app-from-interrupting-macos-system-shutdown