Preserve the optional media properties with goto_url
Preserve the optional media properties with goto_url

Allow the *optional* media properties to carry over from one script
to another. This makes it possible to reuse the previously set
values in another media script. For example:

  - Script A
    - sets qargs.title='foo'
    - sets qargs.goto_url=...

  - Script B
    - reuses the previously set value of qargs.title ('foo')
    - parses the remaining media stream properties

legatvs/libquvi,legatvs/libquvi,legatvs/libquvi