much memory, and was inconsistent, especially with input_CreateThread
taking an array of options

* Revert to using array of options

* To add an item with options:
    - either use playlist_ItemNew, ItemAddOption, and then AddItem
      (useful if you don't have all your options in an array)
    - either use playlist_AddExt (use this if all your options are
      already in an array)

* To add an item without options: use playlist_Add

You can still add options after an item has been added by using either
playlist_AddOption or playlist_ItemAddOption

* Attempt to improve API and solve thread safety issues.
  - playlist_Item* functions allow to touch items only.
    p_item->lock must be used when needed
    (playlist_ItemNew, playlist_ItemDelete, playlist_Item*Info,
     playlist_ItemSet* )

  - playlist_ItemGetById and ItemGetByPos give you playlist_items
    for GetByPos, you should have the playlist lock

At the moment, the playlist_Set* and playlist_*Info functions are kept (they work with position) but should be avoided.

 MODULE_SHORTCUT_MAX ;)

* src/misc/configuration.c, include/configuration.h: added a change_action_add()method to associate an action (that can be triggered through a gui) to a config var.
* modules/gui/wxwindows/preferences_widgets.*: implemented partial support for change_action_add().
* modules/access/dshow/dshow.cpp: use change_action_add() to refresh the list of devices and to add an option to configure a device.

 * defined a CPU_CAPABILITY_SSE2
src/libvlc.(c|h):
 * implemented --see2/--no-sse2

all: more code cleanup and perhaps slightly better bigendian handling though
     more common routines/includes.

   + Unkludged a lot the way the OpenGL output was working until now
   + Optimized here and here. Please test!

* configure.ac: proper checks for all the skins2 dependancies.

Hope I haven't broken anything...

   the monitor (fixed flickering effect)

  Vobsub is working now. only track 0 will be played atm.
  spudec scaling will need to be implemented or vobsub is pretty useless.
* modules/codec/spudec
  Changed an error into a warning message.

* configure.ac: don't link with msimg32 directly has it isn't available on Win9x/NT4.
* modules/gui/skins2/win32/win32_graphics.cpp: use AlphaBlend() from the Win32Factory object.

* modules/codec/dts.c: bug-fix for s/pdif support.

   Parent window created outside the screen so it isn't visible.

Could somebody (AsMaX, ipkiss) have a look at the AlphaBlend() function call in win32_graphics.cpp ? I'd like to use the AlphaBlend() we got from win32_factory.cpp.

* modules/packetizer/mpegvideo.c: fixed major bug where the first frame could be sent out with a null dts.
* src/stream_output/stream_output.c: guard against non-dated packets in sout_InputSendBuffer().

 reading packet).

* modules/demux/util/*: fixed segfault with new vobsub code.

  fen, anymore tips? :)
  There seems to be some trouble with bufferoverflows atm and
  spudec doesn't like the data it is being fed:

  [00000199] spudec decoder debug: i_spu_size=8201 i_rle=29701

swapped.

        export input_CreateThread/input_StopThread/input_DestroyThread.

* modules/gui/wxwindows/*: adapted to the new playlist api.
   "Add MRL" in the playlist dialog now only appends the new item to the playlist.