* modules/video_output/x11/xcommon.c, modules/video_output/directx/events.c: added support for insert/delete hotkeys.

- String fixes
- Sort some large panels
- Change some advanced flags
- Fix & move audio-channel-mixer
- hide picture vout
- Remove saved-volume, replaced by a variable

* modules/video_output/x11/xcommon.c: fixed nasty bug with YV12 xvideo output (fixes problem with unichrome driver).

Sorry for the trouble

    + Gave X11 a higher priority than SDL, so that the all-in-one interface
      still works when the XVideo port is taken. If XVideo is not available,
      SDL isn't of much use though.

* modules/video_output/x11/xcommon.c, modules/video_output/directx/directx.c: when we invert the YV12 picture buffer chroma planes, we need to report a I420 chroma.

* video_chroma/i420_rgb.c: disable RV24 support (which was assuming 32 bits per pixels).

  (fixes glx when X11 isn't runnning)

   - fixed exit in embedded mode when fullscreen.
   - re-use the current video sub-window when switching to fullscreen (to have opengl working in fullscreen mode as well).
   - add options to the opengl plugin.

* modules/video_output/x11/glx.c: OpenGL context is initialized in pf_init() because of threading issues.

* modules/video_output/opengl.c: new platform independant OpenGL vout (uses an "opengl provider" module).
* modules/visualization/galaktos/*: uses the new "opengl provider" module.

   simple interface to create and use OpenGL windows
 * modules/video_output/x11/glx.c: the GLX vout now implements the
  "opengl provider" interface
 * modules/visualization/galaktos/*: no more dependency on GLX: we use
   the generic opengl provider interface instead.

    the conversion ??)

    TODO: - factorization with xcommon.c
          - factorization with glx.c in GaLaktos plugin
          - remove hard-coded values
    (If you don't like the rotating cube, hack the code yourself,
    the variables will come later ! ;)

* modules/demux/avi/avi.c: Look a bit further into the file for the avi tag.
  this allows you to play avi in uncompressed .rar (only first part of course).

 follow the key-pressed scheme (I have removed thoses seeks).
 Someone to do the work ?

* src/video_output/vout_intf.c: only embed the video if the main interface supports it (don't check other interfaces).
* modules/gui/wxwindows/video.cpp, modules/video_output/x11/xcommon.c: in embedded mode, close the vout window if vlc is exiting.

  + vout_RequestWindow() will now cycle through all the available interfaces until 
it finds one with embedded vout support.
    This fixes the issue where embedded vout would stop working when additional 
interfaces are spawned after the main interface is started.
  + vout_RequestWindow() now stores the parent interface pointer into the vout 
object for later use by vout_ControlWindow() and vout_ReleaseWindow().
  + added a vout_vaControlDefault() called by the vouts pf_control() when they 
don't handle something.
* modules/video_output/directx/events.c, modules/video_output/x11/xcommon.c:
  + call vout_vaControlDefault().
* modules/gui/wxwindows/wxwindows.cpp: sets p_intf->b_dead when the interface is 
about to be destroyed.

* modules/video_output/x11/xcommon.c: before using an Xv port, make sure XV_AUTOPAINT_COLORKEY is switched on.

Endianness fix for xvideo vout on big endian processors (I still have problems when shm is disabled, but that might be related to my drivers, if anybody could test that).

  modules/gui/wxwindows/video.cpp: fixed size for VOUT_SET_ZOOM.

* modules/video_output/x11/*: implemented some locking so vout_Control() can be called from another thread.

* modules/video_output/directx and x11: implemented VOUT_SET_STAY_ON_TOP in Control()
* src/video_output/vout_intf.c: moved the video-on-top variable there.