add yet another webpack plugin

[MaxGraey]

With supporting async batching

[balthazar]

What's the point of duplicating things exactly?

[MaxGraey]

Different implementation

[MaxGraey]

For example:

const ButternutWebpackPlugin = require('butternut-webpack-plugin').default;

vs

const ButternutPlugin = require('webpack-butternut-plugin');

• slightly better bundle size
• better speed for large number of chunks
• no-babel dependency

[balthazar]

Comparing the require is not an impactful improvement.

Any benchmarks? PRs exists for a reason too.

[MaxGraey]

@Apercu Actually I started of working one week ago and your implementation I find out only today. Anyway I don't see a problem for example webpack's UglifyJS plugin has three different implementation as minimum.

Benchmark will be later with Closure and Uglify competitors