* fixing Dockerfile for libpng-proto
* adding json proto, LPM, and fuzz target for jsoncpp
* adding vanilla fuzzer back in
* fixing weird spacing in build script + taking out unneedef header file
* adding settings field and passing all of json_str
* adding license headers
* refactoring settings field
* fixing compile issue
* fixing MSan issue, changing license to 2020, and using iterator instead of pointers
* passing pointers more understandably to parse
* taking out unecessary assign
Co-authored-by: Danny Halawi <dhalawi@google.com>