Run Application.MacroOptions from the IntelliSense add-in for VBA descriptions

For VBA functions, we should have a way to run the `Application.MacroOptions` code to register descriptions etc. that show in the Insert Function dialog. I don't know when this is needed or might work for other .xll add-ins - probably not needed. We probably should add a flag to the xml and Worksheet format to indicate this should be done.

Alternatively we might ahve an API taht can be called from VBA to register the descriptions etc, alongside or instead of the Application.MacroOptions code, and instead of the Worksheet / xml solution.