Check for duplicate kudos if the input is untrusted
trivial: Make the status HTML file pretty
Never load SVG files at the native size

SVGs can have a set DPI, but can of course be rescaled up and down.
Manually specify the ideal minimum size (but preserving aspect ratios) when
opening scalable files.

Resolves: https://github.com/hughsie/appstream-glib/issues/11