Add JS formatting with prettier

[Chris Abernethy]

Current JS formatting is not consistent. Implement integration with prettier to manage javascript formatting.

This will generate a lot of formatting changes that will include things like whitespace modifications and conversion of quotes from single to double. None of the expected changes will modify functionality, but they will be extensive and will generate large diffs.

Please advise on how to proceed.

[Astriania]

I'm not going to do this, I don't like opinionated auto-formatting tools and I don't like the 'git blame' on almost every line being a formatting change.