Add custom YamlDotNet emitter that makes all fields with newlines use literal style.

[jedieaston]

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Resolves #280.

This PR adds a custom emitter for YamlDotNet where when it is serializing to YAML, it will make sure all fields with a newline character are set to use ScalarStyle.Literal, which doesn't add newlines to our newlines. Usually, you would just add this to the YamlMember for the property, but since we have a ton of properties that can have newlines, adding partials for all of them seemed to be way harder to support than this. It turns out someone on Stack Overflow had the exact same problem, so I stole borrowed their solution :)

(It also appears that Rider has decided to reformat this file a lot. I can put it back if needed, but since it's just interpreting the existing .editorconfig, maybe you want to keep it?)

Tested: manually, although I'm happy to write tests if needed.

Microsoft Reviewers: Open in CodeFlow

[ryfu-msft]

/azp run

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[ryfu-msft]

@jedieaston, thank you so much for this contribution!

I think a unit test to verify this behavior is needed. I think a good place to do that would be here in CharacterValidation.cs. You can follow a similar approach to the unit test that's already there and then use File.ReadAllText to acquire the text of the generated test manifest and compare the text to verify that the output is as expected.

[jedieaston]

I added a unit test (sorry for the delay, was busy this weekend). It's a bit weird though, as \n, \r\n, and \x85 are all replaced by \n by YamlDotNet but \x2028 and \x2029 aren't.

[ryfu-msft]

/azp run

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Azure Pipelines successfully started running 1 pipeline(s).