Added support to "params" arguments in Excel formulas, for Registration

[amibar]

Hi,

I am using the params feature of the ExcelDna-Registration and I noticed that the IntelliSense doesn't support it.
The code I added deals with this, but with some limitations, see the comment I wrote in the code (BUGBUG).

I don't know if it's the most efficient way to write it, but it works.

Ami

[govert]

@amibar Thank you for the contribution - I'm happy to have some better support for this.
I'll only be able to review and go through the details in two weeks time, though :-(

[govert]

@amibar I'm sorry I have not yet had a look at this. I've spent the bit of time I had for this project on trying to fix the issues relating to Excel 2016. If this is fixed now, I can finally have a look at your changes.

[govert]

@amibar OK - I finally got round to incorporating your request. It was easier for me to bring your code in directly and refactor as I went along than to merge the pull request. But you should see this feature in the IntelliSense version 1.0.7. It still doesn't deal with the case you pointed out where the location goes back to an earlier argument - it looked like a fairly big change to carry through, for not much benefit.

Thank you for your help, and please let me know if you see any issues with the implementation.