Citing from Python 3.12 release:
"A backslash-character pair that is not a valid escape sequence now generates
 a SyntaxWarning (...) In a future Python version, SyntaxError will eventually
 be raised, instead of SyntaxWarning."

 https://docs.python.org/dev/whatsnew/3.12.html#other-language-changes

Add a way to load the local standard C library.
This could be used to load some C standard functions, like *printf ones.

This should work on Linux, Windows and macOS/Darwin environments.

Adds a way to link libVLC log system to a python logging.Logger object.

The logger and log callback is attached to the libVLC Instance object to avoid
the python garbage collector to destroy them too soon.

NOTE: as libVLC log messages are based on a printf + va_list format, we
need to use the standard C `vsnprintf` function with a max fixed size output.

Adds a functional test for the Instance.set_logger method.
This will also test the log_get_context, as this is part of the logger
output.

This can be useful if some logger is set and you want to get access to
it afterwards.