This should help reduce the amount of leaks, as the new npapi::Variant
class handles the memory management automatically.
This also fixes at least a memory leak when converting from string to
anything else

This also adds a few utilities to wrap NPAPI types and use them more
transparently

Close #11990

New property named currentItem, which returns the current playlist item.
The core for this property already exists in the plugin, therefore it
was easy to create the property for activex v2 and mozilla.i

activex v1 already knows this property, but with an other name,
"PlaylistIndex"

Close #12797

ensure that spu and audio tracks are in a 0 based array, not a -1 based one to match the 2.0 behavior of VLC's web plugins

This matches the API of competing web plugins and defined HTML5 behavior. Internal libvlc IDs are converted on-the-fly.

See #4805

Signed-off-by: Rafaël Carré <funman@videolan.org>

Signed-off-by: Rafaël Carré <funman@videolan.org>

Signed-off-by: Rafaël Carré <funman@videolan.org>

Signed-off-by: Rafaël Carré <funman@videolan.org>

The mozilla webplugin events do not support arguments and expose all events available in libvlc. Most
of these events are not usefull for the webplugins and not being able to pass arguments is another limiting
issue. This patch addresses both problems at the same time.

The mozilla webplugin limits supports to the libvlc_MediaPlayer* events just like the ActiveX webplugin does.
These events are usefull in the context of a webplugin.

Ommit the 'libvlc_' prefix from the libvlc_MediaPlayer* events to obtain the events name that must be
used from JavaScript to listen on the event. Example:

- libvlc_MediaPlayerOpening becomes 'MediaPlayerOpening'
- libvlc_MediaPlayerNothingSpecial becoms 'MediaPlayerNothingSpecial'
Signed-off-by: Jean-Paul Saman <jean-paul.saman@m2x.nl>

Conflicts:

	projects/mozilla/vlcplugin.cpp
	projects/mozilla/vlcplugin.h

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

Reverts part of 7db94f4d2fc742537828fbe0c8eb5a and rewrite the code.