Implement afilter transcode filters and renamed vfilter to ufilter (userfilter) so only one extra entry in sout_stream_id_t is needed and not one for every ES type.

* Hilight playing item
* Partial removal support, not yet correct
* Reduce critical section when rebuilding playlist
* Beginning of menu support

   controls. When set to "true", the behaviour of the resizing is changed
   (cf. documentation). The main use for these attributes is to keep a
   a control centered in the layout (horizontally, vertically or both) without
   resizing the control.

Yet another x264 contrib patch for win32

* FFMpeg reactivated the WM3-codec. The patch is now useless

* More useless interaction cleanup
* Small fix for make beautifier

* interaction.c: always show errors through the interaction framework, even if the user disabled its usage
* macosx/*: minor clean-up