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8220d1ee86
EarningsCalendar loader. - Moves most of AdjustedArray back into Python. The window iterator is the only part that's performance-intensive. - Adds a bootleg templating system for creating specialized versions of AdjustedArrayWindow for each concrete type we care about. - Adds support for differently dtyped terms in pipeline. This allows us to use datetime64s which are needed in the EarningsCalendar. - Adds EarningsCalendar dataset for the next and previous earnings announcements in pipeline. - Adds in memory loader for EarningsCalendar. - Adds blaze loader for EarningsCalendar.