media/theonion.lua: Rewrite parse function
media/theonion.lua: Rewrite parse function

Rewrite the `parse' function for the libquvi 0.9+ series.
* Remove now obsolete code (e.g. self.host_id)
* Make media title an optional property
* Implement `TheOnion.iter_streams'
* Update vim modeline

Signed-off-by: Toni Gundogdu <eac2284b3c43676907b96f08de9d3d52d5df0361@gmail.com>

legatvs/libquvi-scripts,alech/libquvi-scripts,alech/libquvi-scripts,legatvs/libquvi-scripts