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Icon theme fallback for missing themes
Fixes: #48
This PR implements a last resort fallback to the default GTK icon theme if COSMIC's theme is missing.
The user is warned if COSMIC's themes aren't available since a correct installation should have them much like GTK should always have Adwaita.
Also some icon themes specify that they rely on other icon theme as fallback when something is missing. COSMIC doesn't implement this behavior at this moment, so it would be neat to have this
This should be implemented in libcosmic instead. Avoid the duplication across projects.