Re-license almost all of libVLC and libVLCcore to LGPLv2.1+

This move was authorized by the developers, either:
 - by e-mail,
 - by vote at the VideoLAN Dev Days 2011,
 - on the license website,
 - in a contract, oral or written.
No objection was raised, so far.

The developers agreeing are:
  Justus Piater
  Alexis Ballier
  Alexander Bethke
  Mohammed Adnène Trojette
  Alex Converse
  Alexey Sokolov
  Alexis de Lattre
  Andre Pang
  Anthony Loiseau
  Cyril Deguet
  André Weber
  Boris Dorès
  Brieuc Jeunhomme
  Benjamin Drung
  Hugo Beauzée-Luyssen
  Benoit Steiner
  Benjamin Pracht
  Bernie Purcell
  Przemyslaw Fiala
  Arnaud de Bossoreille de Ribou
  Brad Smith
  Nick Briggs
  Christopher Rath
  Christophe Courtaut
  Christopher Mueller
  Clement Chesnin
  Andres Krapf
  Damien Fouilleul
  David Flynn
  Sebastien Zwickert
  Antoine Cellerier
  Jérôme Decoodt
  Jérome Decoodt
  Dylan Yudaken
  Eduard Babayan
  Eugenio Jarosiewicz
  Elliot Murphy
  Eric Petit
  Erwan Tulou
  Etienne Membriv...

SUBPICTURE_ALIGN_* must be used instead.

It was duplicated with es_format_t::i_sar_num/den.

 There will be some regressions, I used automatic sed replacement with manual
checks but there was a lot to change.
 It's only the first pass.

It had the following functions:
- text_style_New  -- allocates default text style
- text_style_Dup  -- allocates and copies text style
- text_style_Copy -- copies text style
- text_style_Delete -- deallocates text style

NOTE that the vout_ShowText* functions will take a p_style and copy
it internally so you have to free in the caller function.
 Other modules where p_style was malloced there are now fixed to
copy before calling the vout* functions.

Original patch by basOS G with a few modifications by fenrir.

Signed-off-by: Laurent Aimar <fenrir@videolan.org>

I removed:
 i_x/i_y: redondant with region i_x/i_y. Now a subpicture always represent the
 whole video.
 i_flags: unused anywhere in the core.

 I may have broken a few video filters (osdmenu mainly). I will fix it if you
report the problem and the way to reproduce it.

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

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 is part of a former submission stripped out for easier
 assimilation. It modifies vout_subpictures to use the existing alignment
 field on each region, rather than the alignment on the subpicture plane
 itself. Modifications are made to everywhere that depended on the former
 behaviour, to make it use the new alignment location instead."

* 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.

AUTHORS: updated my entry

Merged OSD functionality on the same core functions. All OSD functionality is described in include/vlc_osd.h now, which entirely replace include/osd.h. The file src/video_output/video_widgets.c uses functionality from src/osd/osd_widgets.c now.

(da big courmischage)

  + improved spu_SortSubpictures() to deal with SPU channels.
  + ephemer subpictures can also have a stop date now (allows more flexibility).

* modules/stream_out/transcode.c: re-use the SPU engine.
* src/video_output/vout_subpictures.c: support for resizing subpictures.

  + introduce a "TEXT" subpicture region type.
  + a psz_text field stores the subpicture text.
* src/video_output/video_text.c: produce "TEXT" subpictures.
* modules/codec/subsdec.c: produce "TEXT" subpictures.
* modules/misc/freetype.c: auto sizing works again.

  (expect some breakage).
* modules/video_filter/blend.c: new alpha-blending module.

* added i_channel and i_content properties to subpicture_t
* p_last_osd_message is no more used

An OSD channel can contain simultaneously an OSD text and an OSD widget.

  successful and VLC_SUCCESS on success, instead of returning void.

* fix broken vout_OSDMessage in other files

 * turned vout_OSDMessage into __vout_OSDMessage
 * __vout_OSDMessage now takes printf style parameters
 * added a macro vout_OSDMessage that calls __vout_OSDMessage with the first
   parameter passed through VLC_OBJECT()

* added a lock when changing p_vout->p_last_osd_message

The last OSD message is now deleted before printing new one.

  location by any module.
* added a OSD config option to the Video options. this will allow you to disable
  the messages printed by OSDMessage. Subtitles will still be shown however.
* src/audio_output/intf.c: volumeSet sets the intf-change variable.
* modules/gui/macosx/vout.m: fix the modifier detection.

* src/video_output/video_text.c: removed legacy code that has been rotting for ages.

All: My shot at improving subtitle rendering in vlc. Now each vout uses a "text renderer" module to render text on the video when needed. I decieded to make this a module type, because other api's (win32 and macosx) is supposed to do better than freetype under some circumstances.

include/video_output.h: added some members needed by text renderer modules
src/video_output/video_output.c: load and unload text renderer module when needed
src/video_output/video_text.c: implemented some functions to show text on the video
include/osd.h: exported the functions to show text
modules/misc/Modules.am, module/misc/freetype.c: new text renderer module, largly based on the old osdtext module.
modules/video_filter/Modules.am, modules/video_filter/osd_text.c: removed the osdtext module
configure.ac: changes "osdtext" to "freetype" some places
modules/codec/spudec/*: when iconv is available, use it to convert textual subtitles from the encoding given by --sub-encoding to utf8. Use new code to render subtitles
modules/control/lirc/lirc.c: use new code to give feedback on buttons pressed. untested.
modules/demux/util/sub.c: remove all traces of the ugly old osdtext module
modules/misc/dummy/*: added a "text renderer" submodule in the dummy module
src/misc/modules.c: included osd.h as it seems to be needed to export symbols


final notes: you need to give a proper value to --freetype-font. This should be the path to a font file freetype2 can handle (almost any format afaik) with a unicode translation table in it. Windows ttf files will do. In linux at least openoffice distributes some fonts that work. I think macosx and beos also has useable fonts.