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, ...).