PDF-834 addition of catalog access to document metadata.

git-svn-id: http://anonsvn.icesoft.org/repo/icepdf/trunk/icepdf@43618 8668f098-c06c-11db-ba21-f49e70c34f74
PDF-832 addition of page loading events.

git-svn-id: http://anonsvn.icesoft.org/repo/icepdf/trunk/icepdf@43619 8668f098-c06c-11db-ba21-f49e70c34f74