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Support BYSETPOS for RRULE events with FREQ=HOURLY

Description

Support BYSETPOS for RRULE events with FREQ=HOURLY

Summary: Ref T10747. Most of these tests already passed; implement BYSETPOS logic for FREQ=HOURLY.

Test Plan: Unit tests now pass.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10747

Differential Revision: https://secure.phabricator.com/D16629