Rename `image-elide' to `image-cut' and add more bindings

Rename `image-elide' to `image-cut' and add more bindings

* doc/lispref/display.texi (Showing Images): Update.
* lisp/image.el (image-map): Move binding to mirror Gimp bindings.

* lisp/image/image-crop.el (image-crop-cut-command): Rename.
(image-cut-color): New user option.
(image-cut): Rename and remove prefix.
(image-crop): Remove prefix.
(image-crop--crop-image-update): Add commands to switch to
move/square modes.