Add org.gnome.Nautilus.FileOperations2 interface
This adds org.gnome.Nautilus.FileOperations2 interface that has same methods with one extra parameter - Parameters that can be used to pass extra data to API. This was last suggestion/idea in https://bugzilla.gnome.org/show_bug.cgi?id=758833 bug.
This also adds new DeleteFiles method to D-Bus interface to allow delete files not move to trash. File deletion has been requested for desktop icons extension - World/ShellExtensions/desktop-icons#30 and also for GNOME Flashback desktop icons - gnome-flashback#28 (closed).