Use AutoDllPlugin

[bmayen]

Bug Report or Feature Request (mark with an x)

- [ ] bug report -> please search issues before submitting
- [x] feature request

Desired functionality.

Please consider integrating https://github.com/asfktz/autodll-webpack-plugin to generate DLLs and improve build times.

[filipesilva]

That looks like a nice way of using the DLL plugin, but unfortunately it still has all the problems discussed in #4565. I'm closing as a duplicate because it's the same thing (it still uses DLLPlugin).

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