Deprecation of the Event Stream system

This system is being deprecated as it is ill-maintained, disused, and very out of date.  The concepts represented here must be reimplemented to support AutoPacket, and will almost certainly require the support of a serialization strategy such as Protobuf or CaptProto.

Until the concept can be revisited, this code should be eliminated in order to facilitate header load reduction.
Fixing race condition

This is potentially a really bad one, would only show up extremely rarely and only during teardown.  Generally speaking, action should only be taken in response to a "true" return value of "expired".