Include the eta and the speed in the progress hooks

Useful when listening to the progress hook, for example in a GUI.
If the file is already downloaded include the size in the progress hook
[facebook] Allow untitled videos (Fixes #1484)
Merge remote-tracking branch 'origin/master'
[francetv] Add an extractor for France2
[francetv] Add an extractor for Generation Quoi (closes #1475)