Modernize (Babel 7 + Hooks)

[jadbox]

This is a quick effort to rewrite with Hooks and updated Babel v7.
I've currently published this under @jadbox/lottie-react-web for testing.

THIS IS NOT ready to be merged yet... very quirks still be working on.

Edit: branch ready for merge

[jadbox]

My branch seems to be working for my project as well as all the storybook examples, however I can't seem to get the test suite running:

Warning: ReactTestUtils has been moved to react-dom/test-utils. Update references to remove this warning.
/home/jdunlap/plus/github/jadbox/lottie-react-web/node_modules/enzyme/build/react-compat.js:144
      throw new Error('react-addons-test-utils is an implicit dependency in order to support react@0.13-14. ' + 'Please add the appropriate version to your devDependencies. ' + 'See https://github.com/airbnb/enzyme#installation');
      ^

Error: react-addons-test-utils is an implicit dependency in order to support react@0.13-14. Please add the appropriate version to your devDependencies. See https://github.com/airbnb/enzyme#installation
    at Object.<anonymous> (/home/jdunlap/plus/github/jadbox/lottie-react-web/node_modules/enzyme/build/react-compat.js:144:13)
    at Module._compile (internal/modules/cjs/loader.js:701:30)
    at Module._compile (/home/jdunlap/plus/github/jadbox/lottie-react-web/node_modules/pirates/lib/index.js:99:24)
    at Module._extensions..js (internal/modules/cjs/loader.js:712:10)
    at Object.newLoader [as .js] (/home/jdunlap/plus/github/jadbox/lottie-react-web/node_modules/pirates/lib/index.js:104:7)
    at Module.load (internal/modules/cjs/loader.js:600:32)