webpack build infrastructure

[Informatic]

There seems to be a webpack plugin that implements quirks required to properly bundle enyo projects:
https://www.npmjs.com/package/enyo-webpack-plugin

Using webpack instead of enyo-dev would be appreciated, since we could also use babel to streamline used syntax, and have better handling of certain issues. (eg. inexistent requires are sometimes missed by enyo-dev?)

This needs to be tested on our codebase, and possibly ported to newer webpack versions.