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Update Babel to 7.13
Update Karma to 6.x
Update Webpack to 5.x and update all loaders
Finally dropped PhantomJS - Karma tests now use ChromeHeadless by default

Internal

-Babel config changes
  - Set the configured browserslist the new top-level option in Babel 7.13, instead of in @babel/preset-env's options
  - Drop the useESModules option for @babel/plugin-transform-runtime, which was deprecated in Babel 7.13
  - Removed harcoded use of @babel/plugin-proposal-optional-chaining and @babel/plugin-proposal-nullish-coalescing-operator as Webpack 5 can now parse these

- Karma config changes
  - karma-webpack 5.x now requires 'webpack' to be listed in frameworks config
  - Karma Server now requires a config object to be passed through a parseConfig() call
  - Shim the global process variable in the test Webpack config, as one of expect's dependencies uses it

- Webpack 5 config changes
  - Set optimization.nodeEnv = false to prevent webpack defining process.env.NODE_ENV via DefinePlugin to prevent a new warning from DefinePlugin about this conflicting with the value nwb sets
  - Removed optimization.noEmitOnErrors
  - postcss-loader now expects options in a postCssOptions object and no longer needs an ident option
  - optimization.splitChunks.cacheGroups.vendors was renamed to defaultVendors
  - Fix Webpack devtool config in Karma config
  - Replace optimize-css-assets-webpack-plugin with css-minimizer-webpack-plugin to avoid a deprecation warning
  - Source is no longer available from the Webpack stats object, calculate gzip file sizes from the output assets instead
  - Use Source.source() when inlining the runtime chunk into generated HTML and remove the new default defer attribute from its script
  - Remove removed watchOptions option
  - Remove removed logLeval option for webpack middleware - use stats: 'none' instead
  - Stopped forcing process.env.NODE_ENV to 'test' before running a Karma server, as DefinePlugin was creating conflicting values war... (continued)

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