Add a couple electron nice-to-haves

[bcomnes]

We do this stuff manually now. Would be nice to clean it up with:

• [x] https://github.com/carter-thaxton/electron-default-menu - [ ] https://github.com/jprichardson/electron-window nah for now maybe later.

[ungoldman]

https://www.npmjs.com/package/electron-window-state

[ungoldman]

https://github.com/bengourley/choo-resume

[bcomnes]

Breaking off the HMR stuff into its own thread as the PR I just sent in is wired up to close this.