Refactor Overlay, HTTP::Server for universal port

These refactorings are required to support the universal port.
Reviewers: @miguelportilla, @scottschurr

Ignore the top 3 (eefc5d9..0ebc9ee) they are from another pull request.
It looks like almost all of the unit tests are #if'd out, but the tests still return pass.  Is that what you want?  Someone may curse you later...