Manual bindings for RTSPToken

Mathieu Duponchelle requested to merge MathieuDuponchelle:rtsp_token into master

I tested it and it works, had to fumble a bit with the GstRcExt part, not entirely sure about it but I was getting Can not impl trait from another crate for Vec<T> with T from this crate and this seemed to be the correct way to deal with it?

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