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escape special chars in csv and json output. (#802)

* escape special chars in csv and json output.

- escape \b,\f,\n,\r,\t,\," from strings before dumping
  them to json or csv.
- also faithfully reproduce the sign of nan in json.
this fixes github issue #745.

* functionalize.

* split string escape functions between csv and json

* Update src/csv_reporter.cc

Co-Authored-By: tesch1 <tesch1@gmail.com>

* Update src/json_reporter.cc

Co-Authored-By: tesch1 <tesch1@gmail.com>

32 of 32 new or added lines in 2 files covered. (100.0%)

1771 of 1931 relevant lines covered (91.71%)

5219253.35 hits per line