[Twisted-Python] Deprecating subproject packaging

[HawkOwl]

> On 23 Apr 2015, at 08:01, Glyph <glyph at twistedmatrix.com> wrote:
> 
> One immediate thing I think we should decouple, though, are our native dependencies.  IOCPReactor should remain in Twisted, but iocpsupport should be a separate, optional dependency, available as an extra.  Similarly, _initgroups, sendmsg, portmap, and raiser should all be optional dependencies, so that Twisted itself can be a pure wheel, and you can opt in to enhanced functionality by installing extras.
> 

Also worth noting, pulling twisted.python.constants out into a separate package has a PR open so that part of this can become reality: https://github.com/twisted/constantly/pull/1

- Hawkie

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