Use DefinePlugin instead of env-replace

[alexilyaev]

Right now there's a preloader env-replace that goes through all files and replaces @@PROPERTY with the values in environments.json.

Then this file is imported and set as a constant on the app module.

That's ok, but Webpack already has a solution for that exact scenario:

// Define global variables that will be available in any chunk
new webpack.DefinePlugin({
  ENV: process.env.NODE_ENV,
  API_URL: appConfig.API_URL
})

This adds variables that are available in all imported modules (not on window just the global Webpack module).

I used it as is, but it could be used as a constant as well (similar to how it is now in Kick):

  if (ENV === 'production') {
    // Enable for performance boost on production
    $compileProvider.debugInfoEnabled(false);

    // Disable console.log outputs for production
    $logProvider.debugEnabled(false);
  }

The main benefit is that we'd be using something that Webpack already provides and familiar to others.
1 less package to download.
No weird characters.