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.
A/V conference now adds user metadata about the stream it is forwarding through XEP-0298.
This is parsed and added to metadata during confirmation on client side.
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- jingle session management is now correctly handled, with id of the Galène client used as
prefix when necessary.
- Galène is now run only when component session is started, avoiding systematic run on
__init__.
- Galène ICE logs are displayed with high verbosity.
- Fix disco identity handling
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