Generate url and load texture from encoded image buffer

Generate url and load texture from encoded image buffer

Make some way to load image from raw-buffer stream.
This raw-buffer will alive when some actor contain this buffer.

Limitation : animated-image, vector-image, animated-vector-image not working now. Will support another patch

1. Generate url from encoded raw buffer like this
  ImageUrl url = Toolkit::Image::GenerateUrl(const EncodedImageBuffer &);
2. When we use URL as this string, we can load it like normal LOCAL file.
  ImageView imageView = Toolkit::ImageView::New(url.GetUrl());
3. Buffer will automatically removed when ImageUrl scope is out-of-date, and no actor use it.

NOTE : even ImageUrl lifecycle is done, cached texture can use internally.

Change-Id: I517d9526d13a6b761792dcb7054864643f209b67
Signed-off-by: Eunki, Hong <eunkiki.hong@samsung.com>