Add multi icon support

[sebinside]

There should be a way to add a secondary icon as seen on the preview image. This should include arbitrary icons but also a couple of presets that are often required (like status, plus, and so on). A similar, but very limited option is provided by Font Awesome. Quick positioning should include all four corners and the center.

Besides quick presets, an option for predefined layouts and proper multi-icon support would be really needed!