Update basic/proxygen servers to support streams and new web views
Changes:
- Move folly init into ProxygenUtils header
- Changes to support clean_api build and test with clang
- Update BasicHttpServer to allow streaming
- Add compatibility for basic server with new views
- Update proxygen server to handle new web views, streaming
All current tests succeeding locally with Proxygen on and off - may need further edits to support the fully functional HSMActionView.