This updates the openapi spec and invokes the code generator to update
to the Jellyfin 10.10.6 API.
A big motivation to do this was because some mandatory fields have been
made obsolete and are no longer included in responses. Sailfin tries to
deserialize these mandatory fields and fails deserializing. It was evident
in the list of sessions to control.
The failing was a bit too gracefully in my opinion, it did not even show
that an error occurred, nor was it logged anywhere. It took some time
to debug.
ApiClient was refractored to use PIMPL. This is mainly done to reduce
compile times whenever the implementation of ApiClient itself changes,
since a lot of files include it.
The loaders have gained support for body parameters, this was somehow
omitted before.