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This improves readability a lot and prevent us from reinventing the wheel.

misc/objects.c: Don't rely on vlc_object_destroy() to destroy objects, but expects vlc_object_release to do it when the refcount goes to zero.
* Meaning, that when created objects gets a refcount to 1.
* Destroying is instantaneous and we don't have to poll for a few secondss or so to wait until the object's refcount reach 0.
* We now track vlc_object_t's mem leaks when libvlc_global is released (Hard error for now, so they don't get unoticed)
* We fail hard if an object is released with a refcount of 1 without being detached from its parent and its children, to make sure such cases don't go unoticed.
(make test or make check still pass after that one. VLC is known to leak one object when no module is loaded, this must be fixed).

Missing some cases that I could not test.
Also ffmpeg/chroma.c is locked, so I can but leave it broken.
Fix is for the remaining modules is obvious and the issue is easy to detect.

This also seems to make the pre-existing Qt4 crash more obvious.

vout: merged all Microsoft Windows specific vouts under msw directory in order to leverage common event handling

- directx: avoid mixing GDI and Direct3D/OpenGL/DirectX (non-overlay) in video window, should help Vista compatibility

* Headers in include must contain the structures and prototypes needed
  by the plugins and should be named vlc_*.
* Headers in include/vlc must contain the structures and prototypes
  needed by external libvlc clients

* Moved and renamed some things in headers. 
   - Removed vlc_cpu.h, vlc_error.h (merged in vlc_common)
   - Removed snapshot.h (merged in vlc_vout.h)
   - Removed vlc_spu.h (merged in vlc_osd.h)
   - Removed intf_eject.h and vlc_interaction.h (merged in vlc_interface)
   - Moved all internal headers to src
   - Merged vlc_video.h and video_output.h and move private things to src
   - Removed vlc/intf.h, vlc/aout.h, vlc/vout.h, vlc/decoder.h and vlc/input.h
     (meta headers for use in modules, and often implying too large 
     dependencies)
* Removed some useless dependencies
* Unexported a bunch of functions and structures used only in src/
  (--> Still some work here)
* Finally made input_thread_t and input_source_t (mostly) private. 
  Added input_GetItem to fetch the input_item of an input_thread
* Cleaned up deprecated entries in vlc_symbols.h and bumped up symbol 
  prefix

This commit has a 99% probability of breaking the build, 0.1% of killing
your cat and 0% of getting you hot chicks.

* ALL: changed VOUT_SET_ZOOM into VOUT_SET_SIZE and implemented a VOUT_GET_SIZE for some of the vouts.

* modules/video_output/directx/directx.c, modules/video_output/directx/glwin32.c, modules/video_output/opengl.c: support on-the-fly aspect-ratio changes.

(da big courmischage)

- 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/directx: no window decoration patch by Marius Kjeldahl (marius at kjeldahl dot net) + modifications by me.

* modules/video_output/directx/*: fixed symbol conflicts when compiling both vout_directx and glwin32 as builtins.

* modules/video_output/directx/directx.c,glwin32.c: don't unload the plugin as we can't unregister our window classes. This fixes crashes with the mozilla plugin.

* modules/video_output/directx: in embedded mode, we now use the current monitor when switching to fullscreen.

* modules/video_output/directx: last attempt at fixing the spurious taskbar item after switching to fullscreen (it actually also simplifies the code a bit as well).

* modules/video_output/directx/events.c: removed unused code.