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Give "Burndown" charts a more straightforward definition and move all the event…

Description

Give "Burndown" charts a more straightforward definition and move all the event stuff into "Activity" charts

Summary:
Depends on D20818. Ref T13279. The behavior of the "burndown" chart has wandered fairly far afield; make it look more like a burndown.

Move the other thing into an "Activity" chart.

Test Plan:

Maniphest Tasks: T13279

Differential Revision: https://secure.phabricator.com/D20819