macosx: added an option to disable the 'Recent Items' list as requested by multiple forum users (closes #1340)

it.

You can not change a playlist_item_t to be a node, when you previously registered events on it, using input_item_t sub items adding event, because the pointer will be destroyed.
If you want to use nodes anyway, you have to explicitely create them.
Note: we were lucky that xspf did work so far, because we were EXCLUSIVELY using invalid pointers, except for the 1st item being added to each playlist_item_t (it did happen before the conversion obviously).

macosx: don't allow the user to open the preferences window multiple times (leading to orphan pref windows which can't be controlled)

audio_filter/converter/dtstospdif.c: Fix odd frame sized DTS conversion to SPDIF. Patch by Julien Robert <jul at mac.com>. (Reported to fix most of the current DTS issues).

control/hierarchical_node_media_list_view.c: Implement a view that only show the node of the media list, hierarchically.

src/control/media_instance.c: Don't wait to have modulo something, to forward the time, that could be crazy.

* Implement MediaInstancePositionChanged and MediaInstanceTimeChanged accurately.
control/event.c:
* Register the all event types.
* Don't strdup() in libvlc_event_type_name().

media_instance.c: Fix the position callback to retun the time. (Next time, we'll fix it to return the position).