Autobahn

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* fix: authextra merging (1191)
* fix: set default retry_delay_jitter (1190)
* new: add rawsocket + twisted example (1189)
* new: WebSocket testing support, via Agent-style interface (1186)
* new: decorator for on_connectfailure
* fix: delayed call leakage (1152)
* new: CLI client (1150)
* fix: set up TLS over proxy properly (1149)
* new: expose ser modules (1148)
* fix: base64 encodings, add hex encoding (1146)
* new: onConnecting callback (with TransportDetails and
ConnectingRequest). **Note**: if you've implemented a pure
`IWebSocketChannel` without inheriting from Autobahn base classes,
you'll need to add an `onConnecting()` method that just does `return
None`.

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* fix: RegisterOptions should have details|bool parameter (1143)
* new: WAMP callee disclosure
* new: WAMP forward_for in more message types; expose forward_for in options/details types
* new: expose underlying serializer modules on WAMP object serializers
* fix: WAMP-cryptosign fix base64 encodings, add hex encoding (1146)

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* fix: import guards for flatbuffers (missed in CI as we run with "all deps installed" there)

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* new: add experimental support for WAMP-FlatBuffers serializer: EVENT and PUBLISH messages for now only
* new: add FlatBuffers schema for WAMP messages
* fix: improve serializer package preference behavior depending on CPy vs PyPy
* fix: relax protocol violations: ignore unknown INTERRUPT and GOODBYE already sent; reduce log noise
* fix: skipping Yield message if transport gets closed before success callback is called (1119)
* fix: integer division in logging in py3 (1120)
* fix: Await tasks after they've been cancelled in `autobahn.asycio.component.nicely_exit` (1116)

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* fix: set announced roles on appsession object (1109)
* new: lower log noise on ApplicationErrors (1107)
* new: allow explicit passing of tx endpoint and reactor (1103)
* new: add attribute to forward applicationrunner to applicationsession via componentconfig

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* new: adding marshal on SessionDetails