Rewrite it entirely... again

[altf4]

The last one went so well!

[NikhilNarayana]

:p

[vinceau]

This but unironically.

We have an ongoing frustration where we're dependent on electron-webpack for our build management but the dependency is no longer maintained. electron-webpack has issues with newer versions of electron v8+ where the source maps are not generated correctly which makes development a pain.

If we have any hope of upgrading Electron we may need to ditch electron-webpack completely in favour of just managing our own build configurations. We don't necessarily have to do this from scratch since there are plenty of boilerplates out there. A trusted one is this one for example.

We might also want to take this opportunity to take advantage of preload.js for our bridge communication so we can hopefully disable node integration in the renderer thread.

[NikhilNarayana]

See #222 for further details