* Use utils::Status in MaterialParser
* Use utils::sstream instead of std::stringstream
* Remove remaining std::cerr and dep; update MaterialParser::reflectParameters
* make error message in utils::Status more generic
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Co-authored-by: Powei Feng <powei@google.com>
* Minor changes in utils::Status
- << operator doesn't have to be friend
- simplify getErrorMessage to not use strlen internally
* Replace std::ostream to utils::io::ostream