web/projects: add FFmpegMediaMetadataRetriever
web: Disclose security breach on Trac server

Edited by me.

Originally-written-by: Michael Niedermayer <michaelni@gmx.at>
web/index: Fix typo in news entry
web/index: remove linebreak in title, fix RSS

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>