* dired.el (dired-mode): Use dnd-* instead of x-dnd-*

* dired.el (dired-mode): Use dnd-* instead of x-dnd-*
	(dired-dnd-handle-local-file): Call dnd-get-local-file-name.
	(dired-dnd-handle-file): Call dnd-get-local-file-uri

	* cus-edit.el (dnd): New group.

	* term/w32-win.el (dnd): Require dnd
	(w32-drag-n-drop): Call dnd-handle-one-url.

	* x-dnd.el: Require dnd.
	(x-dnd-handle-uri-list, x-dnd-handle-file-name): Call
	dnd-handle-one-url.
	(x-dnd-types-alist, x-dnd-insert-utf8-text)
	(x-dnd-insert-utf16-text, x-dnd-insert-ctext): Change x-dnd-insert-text
	to dnd-insert-text.
	(x-dnd-protocol-alist, x-dnd-open-file-other-window,
	x-dnd-handle-one-url, x-dnd-get-local-file-uri,
	x-dnd-get-local-file-name,  x-dnd-open-local-file,
	x-dnd-open-file, x-dnd-insert-text): Moved to dnd.el (without x-).

	* dnd.el (dnd-protocol-alist): New file with generic DND functions.