Add the GDK part of the DND implementation.

Add the GDK part of the DND implementation.

2006-03-21  Anders Carlsson  <andersca@imendio.com>

        * gdk/quartz/GdkQuartzWindow.c:
        (drag_operation_to_drag_action):
        (drag_action_to_drag_operation):
        (update_context_from_dragging_info):
        (-[GdkQuartzWindow draggingEntered:]):
        (-[GdkQuartzWindow draggingEnded:]):
        (-[GdkQuartzWindow draggingExited:]):
        (-[GdkQuartzWindow draggingUpdated:]):
        (-[GdkQuartzWindow performDragOperation:]):
        (-[GdkQuartzWindow wantsPeriodicDraggingUpdates]):
        (-[GdkQuartzWindow draggedImage:endedAt:operation:]):
        * gdk/quartz/gdkdnd-quartz.c:
        (gdk_drag_context_finalize):
        (gdk_drag_context_init):
        (gdk_drag_context_class_init):
        (gdk_drag_begin):
        (gdk_drag_status):
        Add the GDK part of the DND implementation.

        * gdk/quartz/Makefile.am:
        Add some missing headers.

        * gdk/quartz/gdkdrawable-quartz.h:
        * gdk/quartz/gdkprivate-quartz.h:
        * gdk/quartz/gdkquartz.h:
        * gdk/quartz/gdkwindow-quartz.c:
        (gdk_quartz_window_get_nsview):
        New function, for use by the GTK part of the DND implementation