refs #4734

One is the actual URL, the other is a metadata
Close #4157

Close #4341

Close #4818

This would close #4321 , if cli.lua vout function were working

It now uses vlc_clone()
It is started only when needed.
It does not uselessly poll every 100 or 10 milliseconds anymore...

Regression introduced by commit 4a590357.

Identity is not a method but a property
"" is not a valid object path

Should close #4810

Close #4798

 * Remove legacy methods
 * Implement the GoTo method

Thanks to j-b and ivoire