wireprototypes: move wire protocol response types to new module We'll be introducing more types as part of wire protocol version 2. These types are shared between the command handling code (in wireproto.py) and the protocol/transport code in wireprotoserver.py. So they need to go in a new module to prevent a cycle. The types are aliased into the wireproto module, so API compatibility is preserved. Differential Revision: https://phab.mercurial-scm.org/D2088

wireprotoserver: move responsetype() out of http handler This is our last public attribute not part of the protocol interface! Differential Revision: https://phab.mercurial-scm.org/D2087

wireproto: remove unused proto argument from supportedcompengines (API) In theory, the protocol should be passed to this function. But the argument isn't being used and it is getting in the way of refactoring. So let's remove it. We can always add it back later if we need it again. Differential Revision: https://phab.mercurial-scm.org/D2086

wireprotoserver: rename getfile() to forwardpayload() (API) "file" can mean a lot of things. Let's rename the interface method to something more descriptive. While I was here, I moved the docs about the payload format to the implementation of the SSH protocol, because it was lying about what the HTTP payload looked like. Differential Revision: https://phab.mercurial-scm.org/D2085

wireprotoserver: rename _client to client (API) This method is called in wireproto.py. It should be part of the public API/interface. .. api:: The ``_client()`` method of the wire protocol handler interface has been renamed to ``client()``. Differential Revision: https://phab.mercurial-scm.org/D2084

wireprotoserver: remove redirect() and restore() (API) These methods on the protocol handler interface are no longer used in core. .. api:: redirect() and restore() have been removed from the wire protocol handler interface. Use mayberedirectstdio() instead. Differential Revision: https://phab.mercurial-scm.org/D2083