Add:
- http-user-agent
- ps-trust-timestamps
- vout-event
And some rtsp options (username, passwd)
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

I don't know if this is really useful. On Linux it is not really useful
given the libtool versioning algorithm (VER:REV:AGE -> VER-AGE:AGE:REV)
ensures different sonames in any case.

This reverts commit 17eb17c5.

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

Signed-off-by: Laurent Aimar <fenrir@videolan.org>

Should be backported.

 * print a warning when var_DelCallback can't find the callback because the
   data doesn't match
 * these warning are only for debug builds.

 * print an error message when the variable creation failed because of a name
   clash (two variables with the same name but different types)
 * print a warning when calling var_Get on a void variable
 * fix one comment as the list is NOT sorted (and that too expensif to do).

Thisway playlist don't run sort when created (in case of you start vlc,
and don't set playlist visible then adding stuff. When you open playlist
it would sort the stuff).

Also remove showing sort-indicator incorrectly on start (don't show
it at all before user clicks to sort).