enhancing IStreamHandler and IStreamedHandler interfaces so that OSHttp{Request,Response} get passed in,
allowing RestHandlers to set response status code, redirections, etc.
* Removed legacy REST handling
* Created two custom IStreamHandlers for asset up/download
* Removed quite a lot of double and triple encodings, trying to work towards binary only and direct write into storage.
* Introduced BaseStreamHandler with GetParam() and some other goodies