Angular-cli: Add customization options for HtmlWebpackPlugin

[miltador]

Currently app configuration doesn't allow to configure HtmlWebpackPlugin to use it's templating features.

It might be useful to have separate option in app config to specify different value for template option,
e.g. index.ejs to use ejs templates and allow HtmlWebpackPlugin to process it and generate index.html.

Also it would be useful to know the current environment inside the template to conditionally add things to resulting index.html.

[filipesilva]

I understand that there are uses for such a feature, but it's something we want to add at the moment.

[timbru31]

at the moment.

This was >1 year ago. Care to re-consider this decision? We'd like to customize this, too, but don't want to inject, since we ❤️ the Angular CLI.

[that70schris]

this is a real bummer for adding tracking to a site that requires different environments. it pretty much prevents loading 3rd party tracking products using the index file to make sure they load as fast as possible

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