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bc302beec9
- Refactored EventsLoader and BlazeEventsLoader to not require a subclass per dataset. Instead, you now pass a map from columns to event fields directly to the EventsLoader constructor. - Removed a large number of Quantopian-specific datasets and associated tests. - Rewrote the core logic of EventsLoader and BlazeEventsLoader to share index calculations across multiple requested columns. - Fixed a bug where event fields were incorrectly forward-filled when null values were present in an event.