Offering to co-maintain Recurring Date Field Modular Widgets

Thanks!

The same set of advice applies as #3536935-4: Offering to co-maintain Recurring Dates Field →

Project specific advice for DRM:

- Try to keep from adding too many extra features. The widgets are supposed to be extended safely in downstream sites.

Thanks again @dpi, I don't intend on adding too many features, mostly bug fixes, though I suppose if I need to do something drastic it would be worth creating a separate widget Bravo or Charlie 😉