[cppmyth] Add socket setting to tweak read timeout

- SetReadAttempt()
[cppmyth] proto: 60 sec to hang up
[cppmyth] wsapi: 60 sec to hang up
[mythtv] demuxer: Adding info 'interlaced' for video stream
[mythtv] avinfo: Fix Frame Rate for interlaced video stream

- Uses internal stream properties from 'ElementaryStream' instead PVR properties
- Provide all properties from struct STREAM_INFO
- Fix Frame Rate for interlaced video stream (h264)