Update Linter & Remove Unsafe React Lifecycle Events

[IAmThePan]

• Have you followed the guidelines in CONTRIBUTING.md?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you added an explanation of what your changes do?
• Does your submission pass tests?
• Did you lint your code prior to submission?
  • All but one. Will discuss

From Jira Cleanup Ticket (that I don't have access to):

1. Clean up eslintrc.js:

• In eslintrc.js, enable any checks marked with TODOs and fix associated code warnings.
• Additionally remove template-curly-spacing and enable class-methods-use-this, no-mixed-operators, import/prefer-default-export.

2. In React components, search for any life-cycle events marked with UNSAFE_ and refactor to use new React events.

[IAmThePan]

Wrong branch. Want to merge my Unsafe branch