Add support for drop_metadata and merge_tracks

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I'd like Centova Cast to support a solution that is already present in Liquidsoap: drop_metadata and merge_tracks. It would allow to resolve the issue with OPUS streams stopping on each change of metadata.

I already experimented with removing metadata by putting drop_metadata and merge_tracks in RAW configuration, however, without success - Centova Cast shows a lot of errors when I try to restart the server.