Allow cloudformation deploy to accept a paramater file in YAML format

[bs-thomas]

Is your feature request related to a problem? Please describe.
Yes, in aws cloudformation deploy, we now support JSON file as the format for --parameter-overrides. This is really good news, because the long unresolved problem (with Windows especially) with specifying multi-line parameters is now finally resolved by supporting a JSON formatted file.

via this issue: Allow cloudformation deploy to accept a paramater file #2828 (#2828)

However, the values look really ugly. Like this: "first line\nsecond line\nthird line" Ew, yuck!

Describe the solution you'd like
Maybe supporting YAML formatted file will resolve this.

Describe alternatives you've considered
Could be other well-known common formats too, but YAML seems to be the most popular.

Additional context

Something like this?

Parameters:
  DesiredCount: 2
  MaxCapacity: 3
  MinCapacity: 2
  MaximumPercent: 150
  MinimumHealthyPercent: 49
  MultiLineStuff: |
    first line
    second line
    third line

Thank you very much for the time going through this.

[kdaily]

Hi @bs-thomas, I see the related thread where you discussed this. Marking as a feature request. Thanks!

[tim-finnigan]

I think this overlaps with #2275, can anyone confirm or call out any major distinctions between the issues? To consolidate tracking we might want to close this as a duplicate in favor of that older issue.

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