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

Note that the format supported is the one created by FFmpeg, and not one of those described in the ticket.

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.

Made demux2_IsPathExtension case insensitive.
Used demux2_IsPathExtension/p_demux->b_force when appropriate
Fixed a regression in flac demuxer (segfault when reading meta data)
Added a VLC_UNUSED(x) macro to avoid seeing ugly (void)x around the code.
Improved a bit a few vlc_common.h macro (do {} while(0))

(Please report any 'seek' regression)

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

* 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.

    http://forum.videolan.org/viewtopic.php?t=27848
* Fix a few compiler warnings.

* More useless interaction cleanup
* Small fix for make beautifier

- intf_UserProgress* takes an additional argument now. use it to provide the time to go (in sec) until the process will be finished. Provide 0, if you don't have such info. The interface will hide the respective text-field.
- intf_UserProgressIsCancelled can be called by the module which triggered the interaction dialogue on a regular interval, to check if the user cancelled the dialogue or not. This is for dialogues with an optional cancel-button only (like the modal progress panel), so it doesn't replace p_dialog->i_return = DIALOG_CANCELLED which is for yes/no-style dialogues
- intf_UserOkayCancel was removed in favour of an enhanced intf_UserYesNo
- intf_UserYesNo takes 3 additional arguments now to get the custom captions of the default (~Yes), alternate(~No) and one optional button(~Cancel). This provides a better interface experience for the user and is more compliant with OSX's HIGL. The interface automatically hides the 3rd button, if NULL is given.

* use intf_IntfProgress instead of intf_UserProgress to test the interaction-implementations. Additionally, it's nicer here IMO, so we might keep it this way.

What is currently broken:
 * Some playlist demuxers (shout, dvb and pls)
 * DAAP
 * BeOS playlist
 * GPE playlist, I suppose

What has some trouble:
 * Meta handling in several demuxers (most notably TS)
 * Skins2 playlist (doesn't refresh correctly)
 * OS X playlist (see bigben's latest commits)

 - Missing value lists
 - advanced / non-advanced problems
 - description problems
 - tyops