* Fixes to make SizeVerifier work.
In particular change all the places in the Flatbuffers library
and generated code that were using `Verifier` to instead use
`VerifierTemplate<TrackBufferSize>` and wrap them all inside
`template <bool TrackBufferSize = false>`.
Also add unit tests for SizeVerifier.
* Format using `sh scripts/clang-format-git.sh`
* Use `B` rather than `TrackBufferSize` for the name of the template parameter.
* Update generated files.
- add a new method ParseJson to minimize failures during fuzzing
- add default (conditional) move-constructor for Parser
- add a new monster_fuzzer
- switch fuzzers to C++17 and `test/cpp17` generated code
