srt: obsolete SRT_PARAM_CHUNK_SIZE and SRT_PARAM_PAYLOAD_SIZE

Firstly, SRTO_PAYLOADSIZE has no effect for receiver. Secondly,
since there is no negotiation of payload size between sender and
receiver, the receiver should use a buffer at least
SRT_LIVE_MAX_PLSIZE bytes, otherwise the data can be truncated.
So the default value of option SRT_PARAM_CHUNK_SIZE is
inappropriate. User may know exactly the sender's payload size
to set the value for SRT_PARAM_CHUNK_SIZE, but there is no much
gain for doing that.

(cherry picked from commit 0b0cc7ff) (edited)
edited:
* 3.0 had the advanced flag in obsolete parameters

Signed-off-by: Steve Lhomme <robux4@ycbcr.xyz>