rest: new services discovery module to get channels from shoutcast

title

playlist/item-ext.c: O(log(N)) playlist_GetItemById()

Add Track length mode. 
Entry slider fixed update fixed.
Some small memory leaks fixed.

Fix bug in paranoia mode. Now allow two kinds of paranoia - overlap and full.

libcddb 0.96 has regexp memory leaks in - 1.0.0 won't. Be leak free if using
1.0.0.

held. store p_playlist in wxvlc::Playlist since the class can't work without
p_playlist anyway. Strictly lock playlist when needed.

adds a lot of playlist_ItemGetById, and removes a lot of vlc_object_find
VLC_OBJECT_PLAYLIST).

This should fix a lot of potential deadlocks and crashes, including a few I
could reproduce

nodes as well as items.
made playlist_Control not take the playlist lock, and created a
playlist_LockControl that does the same but takes the lock

* src/input/demux.c: skip header id3tag in the core before loading the demux (id3tags have a tendency to mess probing).
* modules/demux/flac.c, modules/demux/mpeg/m4a.c,mpga.c: update id3tag parsing.
* modules/demux/util/id3tag.c: id3tag parsing doesn't need to skip the id3tag header anymore.
* modules/demux/util/id3.c: module removed because id3tag header skipping isn't needed anymore.

* modules/demux/aac.c: removed deprecated aac demux (replaced by the m4a demux which uses the m4a packetizer).

- use execlp instead of execl
- perform process replacement in the child process, not the parent
- wait for process termination (to avoid zombies)
- do not return value from void function
- more verbose

- struct addrinfo check

- Added check for getaddrinfo

   arrives too late to the mux.

   VBI teletext descriptor should not set the codec because they only
   add information on a teletext stream.

   facilities. Fixed a few incoherences with
   i_original_channels/i_physical_channels.

   when there is no packet coming (fixes a "packet sent too late" issue
   with the ts muxer).