build.py: @@INCLUDECSS strips quotes from image filenames
build.py: @@INCLUDECSS strips quotes from image filenames

Both single- and doublequtes
Refactor to dequote before MultiLine transform

Note: may be better use function instead of RE

```
def dequote(fn):
    if fn.startswith(("'", '"')) and (fn[0] == fn[-1]):
        return fn[1:-1]
    return fn
```

3ch01c/ingress-intel-total-conversion,McBen/ingress-intel-total-conversion,sndirsch/ingress-intel-total-conversion,3ch01c/ingress-intel-total-conversion,McBen/ingress-intel-total-conversion,3ch01c/ingress-intel-total-conversion,3ch01c/ingress-intel-total-conversion,McBen/ingress-intel-total-conversion,sndirsch/ingress-intel-total-conversion,3ch01c/ingress-intel-total-conversion,McBen/ingress-intel-total-conversion,3ch01c/ingress-intel-total-conversion,McBen/ingress-intel-total-conversion,sndirsch/ingress-intel-total-conversion,sndirsch/ingress-intel-total-conversion,sndirsch/ingress-intel-total-conversion