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* Remove some unneeded wrappers and locking

This array is now usable as a reliable source of data for size
Use playlist_CurrentSize(p_playlist) to retrieve the size of the current playset.

Not tested heavily yet ...

For interaction implementers: you need to call playlist_Signal after changing the status of a dialog. Please see the diff for qt4/dialogs/interaction.cpp

 * Remove the random special case
 * Use the array of currently playing items for all cases
 * Convert array items to array API
 * Replace standard searches in sorted arrays by bsearches
 * Size is not yet fixed (next round).

Array
 * Add reset/value and bsearch functions
 * Add foreach helper

Update stats in the input threads instead of playlist thread

 * Secondary queue items now have a b_fetch_art flag
 * You can use the playlist_AskForArtEnqueue function to ask for art from an interface. This will enqueue at the begining of the secondary queue
 * other stuff which i don't remember :)
 * (fix issues with previous (and unrelated) DIR_SEP commit)

Start of meta engine stuff. src/input/input.c needs to be fixed a bit. I'll finish it today. @zorglub: now you have to use the psz_arturl meta to display stuff in the interface.

It is now based on a shuffled array of items, so that next + prev takes you back to what you were playing

* Start putting together all interface strings (Refs:#703)

* Add a "playlist-tree" option to force onelevel/catgory mode

* Fix some debug

What is currently broken:
 * Some playlist demuxers (shout, dvb and pls)
 * DAAP
 * BeOS playlist
 * GPE playlist, I suppose

What has some trouble:
 * Meta handling in several demuxers (most notably TS)
 * Skins2 playlist (doesn't refresh correctly)
 * OS X playlist (see bigben's latest commits)

zorglub: i'm not really sure about the i_serial incrementation stuff, could you give it a look ?

Add a PLAYLIST_PREPARSE flag to tell that the item must be enqueued for preparse on add (not implemented yet).

Refs:#192

and all its children.

(da big courmischage)