gio: generate (non-)symbolic and fallback variants for every icon name.
When a themed icon is constructed with several input icon names, add the variants (symbolic as well as level fallbacks) for every icon names, not only the first one. The search order is: first icon name, then its level fallbacks, then second icon name, then its level fallbacks, then all style variants (symbolic or regular, opposite to requested style) keeping the same order again. This fixes the contenttype GIO unit test.
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