CSV format is put on clipboard as BinaryFormatted string

[JeremyKuhne]

No idea why this is the case. We really should just serialize the string itself.

When I fiddled with this in the past I didn't have luck with this as an interchange format with Excel unless I put it on the clipboard as ASCII. I haven't tested this in over a decade so I don't know what the current expectation is.

Task here is:

• See what Excel works with (if anything).
• Flip this to just serialize the string and put it behind an AppContext switch.
• Document how to manually get/put the data exactly the way you want it to be for an arbitrary clipboard format.

[JeremyKuhne]

Resolved this by manually "binary formatting" primitives which is fully compatible with existing apps. This also addresses putting other primitives on the clipboard with a custom "type". #9088