nicer output

* configure.ac: enabled Obj-C exceptions in the OBJCFLAGS (they're currently used by AppleRemote only, but we should extend them to further classes)
* AppleRemote.*: added svn id and proper notes about the MIT-style and GPL dual licensing

* Improve hilighting

   the top left corner of the layout

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.