PR Checklist

• The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/tools/notes/CONTRIBUTING.md#commit-messages.
• There is an issue for the bug/feature this PR is for. To avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it.
• You have signed the CLA.
• All existing tests are passing: https://github.com/NativeScript/NativeScript/blob/master/tools/notes/DevelopmentWorkflow.md#running-unit-tests-application.

What is the current behavior?

• When using --env.uglify the Android build will crash on startup. On both platforms class level CSS will not be applied (and other inconsistencies will occur)
• Webpack config terserOptions are different per flavor...

What is the new behavior?

• Fixes it so that the application will behave properly on iOS and Android.
• Made most the terser options the same between the platforms, and added the --env.ci flag to all the other flavors as it is used to disable terser caching...

Notes

Users will have to either regenerate their webpack.config.js file or manually apply the
keep_classnames:true to the global level terserOptions object as this is a setting that needs to be...