* Added a minimal streaming feature

* Add right-click "info" item in qt4 playlist

* Implement MRL handling for file, disc and network
* Moved input slave option to the global dialog (not file specific and
  avoid cluttering the file subpanel)
* Initial implementation of the network panel based on ideas and work by
  Leo Spalteholz. Thanks !
* Improve layouting and handling of the advanced options subpanel

--This line, and those below, will beignored--

M    modules/gui/qt4/dialogs/open.cpp
M    modules/gui/qt4/dialogs/open.hpp
M    modules/gui/qt4/components/open.cpp
M    modules/gui/qt4/components/open.hpp
M    modules/gui/qt4/ui/open_net.ui
M    modules/gui/qt4/ui/open_disk.ui
M    modules/gui/qt4/ui/open_file.ui
M    modules/gui/qt4/ui/open.ui

Control & Playback buttons have the same size

Adds an help menu with help and about.
Dialogs are still empty.

Patch by Leo Spalteholz, thanks.

* 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.

Still not functionnal and ugly code.

Sesame...

* Fixes to the streaming chain generator
* network: don't print an error message for EINTR

* Remove some unneeded wrappers and locking

Not tested heavily yet ...

For interaction implementers: you need to call playlist_Signal after changing the status of a dialog. Please see the diff for qt4/dialogs/interaction.cpp

* Fixes to dialog singletons
* Forgotten files (definitions of aout_Visual*, unimplemented at the moment)

Make some sttings persistent

Put the add button in the playlist standard panel
Remove duplicated code for playlist widgets

Add button in playlist widget

Cosmetics

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)

Remove the "seeking too far" error, as it happens for broken AVI and is quite confusing

Will have to be updated/factorized when new chain and filter stuff is in.

* Add a CONNECT macro for simple signal->slot connections 
* Untested save support in simple preferences