fix #3263

decodeArtURL( input_item_t *p_item ) should be self-explanatory.
And use it.

Needs testing

And deactivate the set_teletext functions, since they have been removed from libvlc...

It is set up to use the TS muxer

pub   4096R/E79997B5 2010-01-24 [expires: 2011-01-24]
      Key fingerprint = 8B41 4B3D 9A40 7A79 23AC  6B1E 13E9 5EDB E799 97B5
uid                  VideoLAN Release Signing Key (2010)

Lua extensions: fix (again) compilation on Windows. All the obvious function names are already taken by Windows headers

Win32: get rid of calls to GetVersion (CoCreateInstance will fail anyway if the feature is not present)

Thanks to fenrir and ramiro for their continuous work.

Windows already registers CreateDialog as a macro

In fact qstrdup use new but the resulting memory can be deallocated by some C code.

This Lua Extension will get some meta data on the current movie
(or any movie) from the Internet Movie Database and shows it in
a simple dialog box.

Please consider this script more as an example than as a final
version of the IMDb extension.

You can now play with extensions, from the menu View > Extensions

These are the main UI files for extensions' dialogs.

Let's compile!

This contains:
- Extensions manager
- Extensions activation / deactivation functions
- Separate threads for each extension
- Lua specific functions for calling the script

New vlc.dialog library, that allows users to create scriptable dialogs.
The calling vlc_object_t should have register a callback for the variable
"dialog-event".

This patch defines a new type of interactions between the GUI and
so-called 'extensions'.
These extensions are dynamic plugins, that can be scripted, and they can
create GUI dialogs with widgets (like text fields, buttons, ...).

Most of them where already NULL, saying how meaningless it was.