- Temporarily add local, upgraded `@dojo/webpack-contrib`
- Temporarily update package.json for CI
- Replace ExtractTextPlugin with MiniCssExtractPlugin, but pin to 0.4.2
  until shellscape/webpack-manifest-plugin#167
  is resolved
- Replace removed CommonsChunkPlugin with `optimize.splitChunks`
  configuration option
- Remove plugins provided by `mode` configuration option:
  NamedChunksPlugin, NamedModulesPlugin, and DefinePlugin
- Use terser-webpack-plugin over uglifyjs-webpack-plugin-terser
- Upgrade to webpack-mild-compile@3.3.1
- Add runtime chunk, disable default chunk, and force modules into main
  chunk
- Filter css order warnings
- Move optimize-css-assets-webpack-plugin to dist config
- Update tapable typings