Pavel Marek f8a4e2a9d2 Add Period type (#3818) ... This PR adds `Period` type, which is a date-only complement to `Duration` builtin type. # Important Notes - `Period` replaces `Date_Period`, and `Time_Period`. - Added shorthand constructors for `Duration` and `Period`. For example: `Period.days 10` instead of `Period.new days=10`. - `Period` can be compared to other `Period` in some cases, other cases throw an error.		2022-10-28 17:27:20 +00:00
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Standard	Add Period type (#3818)	2022-10-28 17:27:20 +00:00