* build new core webpack config * fix exports in Webpack; use ESM syntax throughout * add bundle config * add standalone config * add style config * prettier... * add dev config * delete legacy webpack scripts * rewire npm scripts to use new webpack configs * cache babel-loader results * fix e2e dev servers * update core Webpack modules * update loaders to latest * remove unused loaders * update Webpack plugins * add mode flags to Webpack configs * remove plugin invocations that are now production-standard in v4 * update webpack-cli * add webpack perf size limit flags * replace ExtractText with MiniCssExtract + IgnoreAssets * UglifyJsPlugin -> TerserPlugin * fix PostCSS processing * enable Terser sourcemaps * webpack/style -> webpack/stylesheets