Some changes and re-organization for animated gif support.
* lisp/image.el (image-animate-max-time): Moved to image-mode.el. (create-animated-image): Remove unnecessary function. (image-animate): Rename from image-animate-start. New arg. (image-animate-stop): Removed; just use image-animate-timer. (image-animate-timer): Use car-safe. (image-animate-timeout): Rename argument. * lisp/image-mode.el (image-toggle-animation): New command. (image-mode-map): Bind it to RET. (image-mode): Update message. (image-toggle-display-image): Avoid a spurious cache flush. (image-transform-rotation): Doc fix. (image-transform-properties): Return quickly in the normal case. (image-animate-loop): Rename from image-animate-max-time.
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