Add support for ToRhino for NurbsCurve for Rhino7

[IsakNaslundBh]

Issues addressed by this PR

Closes #215

Changing it so that version is checked and version5 convert is called if version is 5. For versions above 5 the same methodology is used and is instead put in the main method. ToRhino6 method remove and versioned to the main method.

Test files

Changelog

Additional comments

[IsakNaslundBh]

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[FraserGreenroyd]

Very minor code formatting changes.

Otherwise looks good on code review - code has moved from the deleted file to the ToRhino file which I think it clean and I like the implementation.

As the suggestions are minor and are for formatting @IsakNaslundBh I'm not going to wait for you to commit them - I'll do them now and trigger all the bot checks, then leave you to merge - if you're unhappy with my suggestions that I commit you can then change them before merge - hopefully you don't mind doing it this way, but as I suspect you'll be happy, I figure this is the quickest way to allow a merge so we can unblock the R7 roll out we were discussing 😄

[FraserGreenroyd]

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[FraserGreenroyd]

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There are 6 requests in the queue ahead of you.

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[IsakNaslundBh]

Happy with the changes @FraserGreenroyd .

[FraserGreenroyd]

Should have remembered to do this bit last night...

[IsakNaslundBh]

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