Elimination of the now-empty Invalidate function

This function was once necessary to trigger an object pool flush, but as the object pool concept was removed, there is no longer any need for Invalidate.
Eliminating deprecated ThreadStatusBlock type

This class is not referenced anywhere and its purpose is largely superceded by the CreationRules stack monitoring type.
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This system is being deprecated as it is ill-maintained, disused, and very out of date.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.
Merge pull request #289 from leapmotion/dep-invalidate

Elimination of the now-empty Invalidate function
Merge pull request #290 from leapmotion/dep-eventstream

Deprecation of the Event Stream system
Merge pull request #291 from leapmotion/dep-tstatusblock

Eliminating deprecated ThreadStatusBlock type
Merge branch 'develop' into dep-subreceipt

Conflicts:
	src/autowiring/AutoPacketFactory.cpp