* [webpack] setup lazy loading for all visualizations
* [lazy-load] push renderVis function to <Chart /> state
* no mapbox token
* [lazy loading] use native webpack import func to fix chunk names, add babel-plugin-syntax-dynamic-import, fix rebase bug.
* fix geojson import, undefined t, and fix async css bug
* [lazy load] actually add babel-plugin-syntax-dynamic-import
* [webpack] working dev version of webpack v4
* [webpack 4] fix url issues, use mini-css-extract-plugin and webpack-assets-manifest plugins
* [webpack 4] use splitchunks for all files, update templates to multi-file entrypoints
* [webpack 4] multiple theme entry files for markup vis css, don't uglify mapbox
* [webpack 4] lint python manifest changes, update yarn lock.
* [webpack 4] fix tests with babel-plugin-dynamic-import-node
* [webpack 4] only use 'dynamic-import-node' plugin in tests, update <Chart /> vis promise when vis type changes
* [webpack 4] clean up package.json and yarn.lock after rebase
* [webpack 4] lint?
* [webpack 4] lint for real
