srtobject: make possible to specify more sockopts in SRT URI
Any socket option that can be passed to libsrt's srt-live-transmit through SRT URI query string is now recognized.
Also make the code that applies options to SRT sockets more generic.
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Any socket option that can be passed to libsrt's srt-live-transmit through SRT URI query string is now recognized.
Also make the code that applies options to SRT sockets more generic.