DnD: Bugfixes.
DnD: Implemented guest->host drag'n drop for X11-based guests.
DnD/DnDURIList: Handle symlinks to directories.
DnD/DnDURIList: RTStrAPrintf2 -> RTPathJoinA.
DnD/DnDURIList: RTPATH_DELIMITER is deprecated.
DnD: Bugfixes for Linux hosts.
DnD: Update, bugfixes.
DnD: Update.