Analysis fixes
Fix support for .tvg files in Linux script
Correcly recognize jpegdec in loader_get_video_decoder()
Add debug info about video buffer times
Improve layout detection by filtering by change sizes
Fine tune layout detection thresholds
Make analyzer check more carefully the timestamps of the stream
Make generator warn about input video timestamp problems
Fix timestamp problems in example video
Analyzer: change output format to json
Fix bug in layout detection
Analyzer: use video codec short name instead of long one
Basic test case framework