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

remove unused parameters from:
        EqzFilter() (equalizer.c)
        stereo_to_mono(), mono(), stereo2mono_downmix() (channel_mixer/mono.c)

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.

* 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.

(da big courmischage)

* Each module can declare a "human-readable short name" with set_name
* Modules are sorted by category (set_category, set_subcategory).
  Modules configs can be separated by set_section()
* Separated audio-filter and audio-visual
* Separated extraintf and control
* New command and widget : add_module_list() for comma-separated modules
* Vfilters now use "," as separator

    + Removed u8, s8, u16 etc. for good.
  * ALL:
    + Replaced all occurrences of u8, s8, u16 etc. with uint8_t, int8_t, etc.

    using the waveout module.
  * ./bootstrap: we ignore comments when parsing makefiles.
  * ./modules/audio_filter/converter/fixed32tofloat32.c: changed this module
    so that it also does float32tofixed32.
  * ./modules/*: ported a few other modules to WinCE (most of the time it's
    just a #include <errno.h> that needs to be removed).

* Fixed detection of VCD support under OS X.2.

new ones.

* Audio and video should now _always_ be perfectly in sync.
* Changes in a52.c (end_date management) must be ported to other codecs,
  otherwise mixer errors will appear.
* Audio output plug-in can now tell whether they can handle a little
  clock drift (for instance, inserting zeroes after a pause).

* Major changes in the handling of dates in the audio output ; still buggy,
but differently.
* Fixed a major bug in the aout pre-filters, preventing to run any other
decoder than liba52.
* p_aout->output.pf_play now has only one argument.

  * ./modules/audio_filter/converter/*: fixed a bug in all the converters
    test routines (thx Meuuh).

    return value to avoid audio starvation.
  * ./modules/audio_filter/converter/*: a little loop optimization trick.
  * ./src/audio_output/aout_ext-dec.c: removed this deprecated file.