* lisp/org.el (org-mode): Call the setup function for yank-media and
DND.
(org-setup-yank-dnd-handlers): Register yank-media-handler and DND
handler.
(org-yank-image-save-method, org-yank-image-file-name-function)
(org-yank-dnd-method, org-yank-dnd-default-attach-method): New
defcustoms.
(org--image-yank-media-handler, org--copied-files-yank-media-handler)
(org--dnd-rmc, org--dnd-multi-local-file-handler)
(org--dnd-local-file-handler, org--dnd-attach-file, org--dnd-xds-method)
(org--dnd-xds-function): Add yank-media and DND handlers.
* doc/org-manual.org: (Drag and Drop & ~yank-media~): Describe the new
feature in the manual.
* etc/ORG-NEWS: Advertise the new features.
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