if skip missing fonts is set we want to read the file
as much as possible so we will also skip any missing
xobjects like images, forms or postscript code
this doesn't fix the reported issue since the pdf itself is corrupted on page 8 however it will
allow recovery in some scenarios where text content isn't important.
also adds more informative error when stream unintentionally passed with non zero offset
previously the only way to test if a password was correct was to supply a single password and throw if the value was incorrect. this was slow. now parsing options supports a list of passwords as well as a single password option (which is equivalent to a list with a single item). these passwords are all tested at the same time and an exception is only thrown once all passwords are tested.
