Split it up into a number of targeted modules for each purpose, for example loop
data, I/O sources, timeouts, and channels. No actual change is intended to be
part of this commit.
This type acts for a handle to storage of non-`Send` data. The handle itself is
sendable across threads and is therefore suitable for storage in a `Future`.
This data uses communication internally and a new method on `Task` to ensure
that when the data needs to be accessed the future will find its way to the
right thread.
More on this type coming soon!
Alex Crichton