ENH: datetime-meta: Remove 'events' from the datetime metadata

The events don't fit well within the datetime, causing many special
cases and complicating the datetime code. A better way to proceed,
which received approval from Travis with regard to the reason events
were introduced in the first place, is to do the following:

* Generalize the structured arrays so they work with ufuncs
* Either use NPY_UBYTE, or introduce a new integer modulo N type
* The structured dtype [('date', 'M8[D]'), ('event', 'u8')], then
  will operate identically to the design of events in datetime.

These other changes will have much use elsewhere as well.

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