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The old VLCIntf macro is deprecated, getIntf() should be used
instead.

Uses NSWindowController to load the information panel. Get rid of
the singleton. VLCMain will now hold one instance, which is aimed
to display information about the currently playing media.

Adds helper method createItemsFromExternalPasteboard: returning
an array of file items from the pasteboard.
performDragOperation: in VLCCoreInteraction is the now only place
where we try to add the dropped file as a subtitle.

This renames the playlist related class files to match the class name,
which makes it easier to find the which belongs to a certain class and
follows common Cocoa/Obj C file naming conventions.
Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>

Only self should be used as callback parameters. Otherwise,
depending on the destruction order the original object might be
deinitialized already.

By deinitializing VLCMain, all connected objects are supposed to
be deallocated automatically. If [VLCMain sharedInstance] is gone,
the intf is deinitalized (this was previously checked with a
nil value of VLCIntf).

Fixes some retain cycles in input manager and playlist code which
prevented these objects to be deinitalized.

macosx: privatise instance variables and resolve class dependencies on internal implementation details

Playlist view gets updated to display new information.
Info dialog gets updates (shows only information about currently
played input at the moment).

close #13729

And expand outline view tree if necessary.

This simplifies the methods, also using a simpler storage for
dragged items.

This removes the old own-made search functionality and replaces
it by a version the user would expect (i.e. actually hiding non-
found entries).

close #6049

The current playlist model directly operates on the core playlist
datastructures without proper locking for a complete playlist table
reload/update. This resulted in various ugly hacks and workarounds.

The new playlist model encapsulates the data in own objects like
in the qt interface. This allows a much easier integration with
the table view and proper updates from the core playlist.

This way, the previous playlist objects, stored in an ugly map with
pointer strings as keys, pointing to the same pointer inside a
NSValue, is obsolete finally. :-)