New repo, support cmd/go 1.18 fuzzing
This release includes:
- Rename to fzgen (from older https://github.com/thepudds/fzgo), with new repo.
- Support cmd/go 1.18 fuzzing.
- Better runtime chaining of function calls under test. (See README).
- Option to emit valid Go code for standalone crash reproducers (via FZDEBUG=repro=1).
- Automatic roundtrip tests for targets that implement encoding.BinaryMarshaler/TextMarshaler interfaces.
- Better corpus encoding.
- Updated README.
- An intention to bring to 1.0.0 quality.