cmd: Improve hugo list command

[jmooring]

1) Add a "published" subcommand to list content that is not draft, expired, or future.

2) Add "kind" and "section" to CSV output (two more columns at the end).

[cmahnke]

3. add order by date

[jmooring]

@cmahnke As written, this proposal has zero complexity, no additional overhead, will be easy to review, and has a decent chance of being accepted by bep. So I prefer to keep the proposal as-is, and defer sorting for another proposal.

[cmahnke]

Ok, understood.

I had an proposal in mind, maybe you can get warm with the idea for that other proposal:
Given the fact that list fails for example with malformed language files (those in i18n) I had the impression that list builds a (almost) full in-memory build (at least it's parsing more then the front matter).
If thats's the case, why not implement list as internal templates? Maybe like the markup handlers? I.e. having it overwriteable by templates in ./layouts/_default/_hugo/list?

But that's just a (maybe stupid) idea for the another proposal...