* Notifications : do not embed InlineImage with wrong secret
* HtmlSanitizer : remove data-img-* attributes if not the same iTop (using approot from Config)
* move \HTMLDOMSanitizer::ProcessImage to \InlineImage::ProcessImageTag
* data-img-* attributes name are now InlineImage class constants

(cherry picked from commit 0aab80917a14e26af821fac2c0dc1e87bbe1fded)