[generic] Update test
[generic] Modernize tests
[ted] Use the rtmp links if there http downloads are not available.
[9gag] Fix and improve extraction
[fivemin] Get the 'sid' from the embed page (fixes #2745)

It allows to download some videos that failed.
[youtube:playlist] Correct playlist ID output

The ID now starts with PL, so we don't need to output that twice.
Add an extractor for tlc.de (fixes #2748)
[canalplus] Prefer f4m and modernize (Closes #2749)
[canalplus] Download the video in the test

It doesn't use rtmpdump now.
[tlc] Add an extractor for tlc.com

It uses the same system as discovery.com
[podomatic] Improve video URL extraction (Closes #2763)