Lines with space characters immediately before line break.

[wspresto]

When serializing a scalar block literal type, and there exists a space character ' ' immediately before a line break '/n' or '/r' in any of the lines within, the Emitter class ignores the requested Scalar Style and defaults to Double Quoted.

A space character before a line break is valid yaml.

Here is a sample project that reproduces the issue:

https://github.com/wspresto/yamldotnet-empty-space-bug

@aaubry This issue coalesces the concerns I was expressing to you throughout the project history. I apologize for my previous scattered comments that may have been confusing. Hope this helps!