* Remove the BUrlRequest class, which was only delegating work to
BUrlProtocol and subclasses
* Rename BUrlProtocol to BUrlRequest, and BUrlRequestHttp to BHttpRequest
* Creating a request is now done through the BUrlProtocolRoster. For
now there is just a static MakeRequest method, this will be completed
when we get to actually allowing add-ons to provide different request
handlers.
This allows cleanup of the API for requests:
* Remove the universal SetOption method with constants, and have
dedicated setters for each protocol option.
* Setters can now have multiple parameters, for example you can give
BHTTPRequest a BDataIO and a known size
* In this case, the BHttpRequest will not use HTTP chunked transfers,
which were always used before and made most servers unhappy (tested and
failed with lighttpd, google accounts and github).
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