Process named chunks instead of entry points

[roryabraham]

This PR refactors the plugin so that all named chunks are sorted, not just specific entry points. So far as I can tell everything else works the same. This addresses the limitation described here

[roryabraham]

I'm not sure if this is a breaking change, but I don't think so. For me, the list of chunk names is essentially a superset of the list of entry point names.

[tholewebgods]

Any update on this? This appears like a useful change to me.

[ylavoie]

That would prove usefull here too

[roryabraham]

For the sake of transparency, I don't have any current plans to continue with this PR since it's no longer a business need for us.