rtcp-fb inconsistent

[clux]

trr-int is currently labelled as a push attribute, meaning it can be more than one per media stream, but this seems unlikely from reading rfc4585.

also, trr-int basically pass the normal rtcp-fb regex, maybe just join them?

[Saku2]

rtcpFb is defined as a single object in the type definitions. This causes a crash as the writer code tries to iterate over it because it is labelled as push.

Could you either turn the 'push' to 'name' as the original issue suggests, or change the type definition to an array.