asset_svg()
Twig function of the framework; its result is HTML and is printed without escaping.
The markup of an SVG asset, to place it inline, e.g. an icon styled with CSS. The XML declaration and doctype
are removed and the given attributes are set on the root svg element. The output is HTML and is printed
unescaped. An unknown or invalid name, a file that is no .svg or has no root element svg are errors.
Returns string