Built-in Calendar Gramplet

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@csam

I typically use a web site to look up the date for e.g. Dominica Quasimodogeniti in 1783, but it would be handy to have the functionality in Gramps. Maybe the is would be another gramplet?

We can easily create a function that works like: get_date_from_liturgical("Dominica Quasimodogeniti", 1783). But where could we put that in the UI? I don’t think the calendar widget is the right place, and I’m working to try to simplify Gramps overall complexity.

Perhaps we could create the DateGramplet (to rule them all) that packages up all of the great date functions that we have (date math, conversions, liturgical lookups, etc.).