Selenium-wire

------------------

* Fix bug where Selenium Wire would attempt to close running event loop.

------------------

* Fix bug where IPv6 addresses were not being enclosed in square brackets, breaking the local proxy URL.

------------------

* Fix additional problems caused by IPv6 socket binding.

------------------

* Fix bug where binding to IPv6 socket would prevent Selenium Wire from starting.

------------------

* Rework the default backend to:
* improve performance when connecting to upstream proxies
* remove the need for starting an openssl subprocess for certificate generation
* fix issue where duplicate headers could not be proxied to the upstream server
* fix issue where the response status code was being overridden by the CONNECT status
* lay the groundwork for supporting websocket message capture
* lay the groundwork for supporting SSL pass-through

------------------

* Fix bug preventing mitmproxy backend from using custom confdir.