[poppler] page::raw_text() for poppler-cpp

[suzuki toshiya]

Hi,

Attached patches are the introduction of new method
to access raw text via poppler-cpp binding.
I wish some maintainer of poppler-cpp can review it.

poppler-0.15.0_cpp-lib.diff
patch to declare new method and its implementation

--

Also I extended cpp/tests/poppler-dump to compare
page::text() method and page::raw_text().

poppler-0.15.0_cpp-tests.diff
patch to add new options to poppler-dump, "--show-texts"
and "--raw".
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