(Vector) Support EncodedImageBuffer can use for vector image

(Vector) Support EncodedImageBuffer can use for vector image

Support to append extension when we use imagetype

For example, if EncodedImageBuffer has VECTOR_IMAGE type, we will generate url
"enbuf://3.svg" So we can use it directly by ImageView -> SvgVisual

And also, let we support Remote animated vector image.
(Since we can load animated vector image by raw buffer.)

Change-Id: I09fd214021507cd8d29bbd3c3720d4427f5eedd7
Signed-off-by: Eunki Hong <eunkiki.hong@samsung.com>