There were a number of problems here:

- the /Resources key of a page object may be an indirect object
- the /Font key of a resource object may be an indirect object
- the /Length key of an object may be an indirect object

So in all these cases handle not only a direct dictionary / number but
also when we have a reference-to-dictionary/number.

Change-Id: Ie74371f0ba43a133a1299843ef20cbfc75fe26d7