EmbedIO experiment

[hatton]

This change is 

[andrew-polk]

Can't say I understood all the ins and outs, but it looks reasonable.

@andrew-polk reviewed 6 of 6 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @hatton)

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src/BloomExe/web/RequestInfo.cs line 113 at r1 (raw file):

                Logger.WriteEvent(
                    "Could not write requested data: connection closed. " + e.Message
                );

Do we want to report to the user here like with HttpListenerException?