AFLplusplus Support

[domenukk]

Great project!
As development on afl itself doesn't seem to be high priority anymore, it would be nice to see out of the box support for additional afl-based fuzzers, such as afl++.

[bmc-msft]

User-provided custom fuzzers is a first-class supported feature. We have a few examples, including honggfuzz, domato, and even compiling an libfuzzer targets from oss-fuzz integrated projects.

That said, including support for AFL++ as a built-in path should be straight forwards.

Given the large number of ongoing research efforts based on AFL, we should make it stream-lined to let users pick from an arbitrary set of AFL implementations, including making it easy to add new builds, versions, or forks of AFL.