Pyro5

- removed Python 3.7 from the support list (it is EOL). Now supported on Python 3.8 or newer.
- fixed cgi.parse deprecation problem in http gateway
- removed jquery dependency in http gateway
- some small tweaks to setup, tests, examples, and docs.
- updated the self-signed example certificates and serial numbers in the ssl example.

- http gateway now also has OPTION call with CORS
- fixed deprecation warning about setting threads in daemon mode
- fixed more threading module deprecation warnings
- proxy now correctly exposes remote __len__, __iter__ and __getitem__ etc
- improved type hint for expose()
- added Proxy._pyroLocalSocket property that is the local socket address used in the proxy.
- serve() no longer defaults host parameter to empty string, but None. To be more similar to what a creation of Daemon() normally does.
- fixed a Python 3.11 serialization issue

- fixed `expose` issue on static method/classmethod due to API change in Python 3.10

- removed Python 3.6 from the support list (it is EOL). Now supported on Python 3.7 or newer
- corrected documentation about autoproxy: this feature is not configurable, it is always active.
- introduced SERPENT_BYTES_REPR config item (and updated serpent library version requirement for this)
- flush nameserver output to console before entering request loop
- added optional boolean "weak" parameter to Daemon.register(), to register a weak reference to the server object
that will be unregistered automatically when the server object gets deleted.
- switched from travis to using github actions for CI builds and tests

- fixed error when import Pyro5.server (workaround was to import Pyro5.core before it)
- documented SSL_CACERTS config item
- removed Python 3.5 from the support list (it is EOL). Now requires Python 3.6 or newer

- reworked the timezones example. (it didn't work as intended)
- httpgateway message data bytearray type fix
- fixed ipv6 error in filetransfer example
- added methodcall_error_handler in documentation