Creates an image tag.
Required attributes: file, src, or data.
| alt: | Alternative text to the picture. |
| border: | Size of image border. |
| width: | Width of image. |
| height: | Height of image. |
| file: | Name of an image file in web server resource directory. |
| src: | You specify an image file directly. This value prevails over "file" attribute. |
| data: | A CKByteData object to display as image. If you create the object without resource manager, You must use this with "mime" attribute. |
| mime: | MIME type for a resource of "data" attribute. |