Libervia Media is now a Python package instead of files to put in a directory to specify
in settings. The discovery is now automatic, removing the need for settings and enabling
easier installation. Furthermore, it should now work even if the package is zipped.
`libervia_media` can now be specified as a dependency for frontends requiring it.
This is a huge configuration refactoring.
The configuration system now uses Pydantic settings, with better validation, better
support for environment variables and other goodies.
The main config files now use TOML instead of INI, this allow for better handling of
complex types, notably dict.
Plugins, components and frontends can declare their config settings in a class which will
be imported dynamically.
