Add the possibility to keep the js class names in the production build

Created by: svenliebig

I added an environment variable to prevent the terser plugin from minifying js class names in the production build.

The variable is: KEEP_CLASS_NAMES - i added an example in the documentation, beneath the production-build documentation.

There is no major change, the production build will be equal to the production build before this pull request, if there is no environment variable set.

requested review from @root

requested review from @root

requested review from @root

requested review from @root

requested review from @root

requested review from @root

requested review from @root

requested review from @root

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Created by: stale[bot]

This pull request has been automatically marked as stale because it has not had any recent activity. It will be closed in 5 days if no further activity occurs.

added stale label

Created by: svenliebig

Is there any possibility to get this merged?

removed stale label

added issue: proposal tag: enhancement labels

assigned to @root

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