fix(ngSanitize): attribute name: xmlns:href -> xlink:href

Closes #9769
test(ngSanitize): enhance test regarding the `xlink:href` attribute

Closes #9770
feat($anchorScroll): add support for scrolling independently of `$location.hash()`

Add an optional argument to `$anchorScroll()` to enable scrolling to an
anchor element different than that related to the current value of
`$location.hash()`. If the argument is omitted, the value of
`$location.hash()` will be used instead.

Closes #4568