fields is GONE (HttpServer does not support that), you can read the
"normal" HTTP headers available via properties, and you can add
headers. also, it is now possible to set a timeout for KeepAlive (for
those clients that pay attention to it).
this also fixes the broken REST inventory/assets/appearance services,
they should be working again.
testcase for OSHttpResponse will follow.
* This is a HUGE update.. and should be considered fraut with peril.
* SSL Mode isn't available *yet* but I'll work on that next.
* DrScofld is still working on a radical new thread pump scheme for this which will be implemented soon.
* This could break the Build! This could break your Grid!
enhancing IStreamHandler and IStreamedHandler interfaces so that OSHttp{Request,Response} get passed in,
allowing RestHandlers to set response status code, redirections, etc.
