(Refer to the previous commit for rationale)

In older VLC versions, we had to use the same X11 display for the
window provider (the UI) and the video outputs to avoid Xlib aborts.
We do not need this anymore. Morever, the XCB outputs can detect the
error and fail safe.

To change the UI display, the DISPLAY environment variable is used.
The only real use case for --x11-display is output to a different
display than that of the UI. This change restores this use case,
and simplifies the Qt4 interface.

Bug: right-click on an empty node leads to a segfault

It was broken a looong time ago because the XML structure
of their web page is broken

File paths without file:// don't work anymore

MOC files should not be created if the ML is not built

doDelete() should be virtual
getMeta() and getArtPixmap() helpers in VLCModel

This will need a proper fix once both Xcode 3 and 4 are available.

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

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

On Linux, drag&drop provides a null-terminated character string, consisting of
one or more filenames. When there are more than one filename, either CR LF
(e.g Nautilus) or just LF (e.g Konqueror) are used as the sub delimiter.
This patch ensures that drag&drop now works for both cases.

In addition, if more than one item are selected, only the first item is
launched instead of all of them.

Remove variables that were never used, especially in tree_update structure

limit rebuilding the playlist control only when the notified item is
 expected to be visible. This improves responsiveness when playlists
are very large.

On a normal Win32 released build, we aren't going to ship the BCM dll
or ask our users to install the good version of the dll at the right
place and recompute the plugins cache...
Therefore, we need to open the dll and resolve the symbols.

ML holds some PL resources