Fixed eslint & console errors

[bingalls]

Fixed all errors & warnings in Eslint & JS Console.
2 warnings remain:

• deprecated componentWillMount remains
• socket.io does not set MIME type

[bingalls]

Updated npm libraries to fix all warnings in JS Console.

• yarn outdated is clean
• yarn audit is clean
  Still needs work for eslint & prettier

[CLAassistant]

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1 out of 2 committers have signed the CLA.

✅ bingalls
❌ Bruce Ingalls

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[PaulMorel1]

I'm not an approved contributor here, so take this with a grain of salt.

There's a lot of good stuff here, but it feels like it should be at least 3 separate pull requests, rather than one big one. Some of this is great, but other stuff is not desirable or unrelated.

[PaulMorel1]

It seems like upgrading packages is unrelated to fixing linting errors. Why bundle them into the same pull request?

[PaulMorel1]

I like that you added this, but again, this feels like it should be a separate PR.