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 * add missing const qualifiers
 * prevent exception from being silented in case of ENOMEM

- control APIs: do not crash if exception parameter is null, that means caller is not interested in exceptions

- libvlc control: uninitialiazed mutex and variables, was prevent browser plugins from adding elements in playlist

* 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.

- revert 16847, this breaks the activex and mozilla plugins, and passing a argv[0] is a very desirable feature as the path in argv[0] is also used to search for plugins. Typically users can pass on the argv[0] of their programs

that users of the API can simply pass parameters

Convert the new libvlc API (so, the one that is in src/control) not to use the old libVLC API (the one that is in libvlc.c, er, no, was... ah... maybe it's the internal one... err .... well, it's about vlc for sure...)

Also, make it clearer what is shared and instance-specific

So,
libvlc_t ==> libvlc_global_t
vlc_t ==> libvlc_int_t (internal instance)

p_object->p_libvlc ==> p_object->p_libvlc_globale
p_object->p_vlc ==> p_object->p_libvlc

VLC_OBJECT_VLC ==> VLC_OBJECT_LIBVLC

And by the way, there is some cleanup required :) (ie, some things are created in the global object instead of the instance-specific one)

- allow for libvlc_exception_t to be NULL in APIs
- remove X11 references from libvlc, as it breaks MacOS X

Shame on me

* Some test work
* Export vlm_MediaSearch

Fix a bug in exceptions handling

Add some playlist functions

Fix compilation

header from internal headers. 
Patch elaborated with Olivier Aubert.