fix(@angular/cli): use webpack 4

[filipesilva]

Just trying it out for now. Latest version changelog and feedback thread at webpack/webpack#6357.

Webpack slated for 4.0 final in 25th of February (see https://medium.com/webpack/webpack-4-beta-try-it-today-6b1d27d7d7e2).

To-dos:

• use webpack.debug.ProfilingPlugin()
• configure System.import usage (see Disable System.import parser plugin by default webpack/webpack#6321)
• replace CommonsChunkPlugin (see Refactor chunk graph webpack/webpack#6341 and https://gist.github.com/sokra/1522d586b8e5c0f5072d7565c2bee693)

Blockers:

• refactor: use .add instead of .push for compilation dependencies webpack-contrib/copy-webpack-plugin#174 (not an issue with alpha.0)
• webpack v4 migration plan jantimon/html-webpack-plugin#816
• postcss-loader uses loader._compilation.applyPluginsWaterfall (2.x doesn't)
• file-loader uses options.context
• rxjs path mapping breaks webpack 4.0.0-alpha.2 feedback webpack/webpack#6179 (comment)

Warnings:

• copy-webpack-plugin
  • Tapable.plugin is deprecated. Use new API on .hooks instead
• extract-text-webpack-plugin
  • DeprecationWarning: Chunk.entrypoints: Use Chunk.getEntrypoints()
  • Chunk.entrypoints: Use Chunk.addEntrypoint/setEntrypoints to modify entrypoints.
  • Chunk.chunks: Use Chunk.getChunks() instead
  • Chunk.parents: Use Chunk.getParents() instead
• ./src/paths-plugin.ts
  • DeprecationWarning: The callback argument was splitted into resolveContext and callback.
• ./angular_compiler_plugin.ts
  • DeprecationWarning: Tapable.apply is deprecated. Call apply on the plugin directly instead
• ./src/scripts-webpack-plugin.ts
  • Tapable.plugin is deprecated. Use new API on '.hooks' instead
• WARNING in asset size limit for large bundles/assets

Fix #9058
Fix #9069
Fix #9135

[pleerock]

I guess I do not have index.html in build because of the following code?

[filipesilva]

Correct, we're still waiting for plugins to be updated. At the moment this PR is not ready.

[pleerock]

Thank you, looks like we are expecting #816 to be resolved

[filipesilva]

Superseded by #9459.

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