Copy RTF data to the clipboard

[anirudhrb]

Summary of the Pull Request

RTF data is now copied to the clipboard. Tested by copy pasting text from terminal to WordPad.

PR Checklist

• Closes Feature Request: Rich Text Format (RTF) Copy #2487
• CLA signed. If not, go over here and sign the CLA
• Tests added/passed
• Requires documentation to be updated
• I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: Feature Request: Rich Text Format (RTF) Copy #2487

Detailed Description of the Pull Request / Additional comments

Mostly similar to PR #1224. Added a new static method GenRTF in TextBuffer that is responsible
for generating the RTF representation of a given text. The generated RTF is added to the DataPackage that is ultimately passed to the clipboard.

Validation Steps Performed

Validated by copy pasting text from the terminal to WordPad. Validated with different colors to make sure that is working. (MS Word seems to prefer HTML data from the clipboard instead of RTF.)

[carlos-zamora]

Awesome! Thanks! I feel like there's a way to share code between GenHTML() and GenRTF() but I don't think that's worth blocking over. I created #3538 to track that.

@DHowett-MSFT Thoughts on bringing this into ConHost too? I feel like that'd be a separate PR but definitely relevant.

[DHowett-MSFT]

Yes, this will be cool for conhost.

[zadjii-msft]

This looks great to me. Thanks for doing this!

[zadjii-msft]

@anirudhrb it looks like the code formatting check is failing - could you run tools\runformat in the root of the repo?

[anirudhrb]

Yes, this will be cool for conhost.

@DHowett-MSFT @carlos-zamora What needs to be done to bring this into conhost? Are you gonna create a new issue?

[DHowett-MSFT]

Followup filed at #3560. No need to do it in this one. 😄

[carlos-zamora]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[ghost]

🎉Windows Terminal Preview v0.7.3291.0 has been released which incorporates this pull request.:tada:

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