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This bumps the required C++ version to C++20, in order to use std::span.
This fuzzer takes input, compresses it, decompressed, and compresses it again, and checks that the two compressed versions are equal. This is a simple correctness fuzzer. Note that we can't just compare the decompressed version to the original input because decompression might produce a slightly different TTF file to the input, even though they are functionally the exact same thing.
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This PR uses std::span for all the raw pointers that can reasonably be rewritten (found with -Wunsafe-buffer-usage). When built with libc++ hardening this will crash on all out-of-bounds accesses instead of causing undefined behavior. This is mostly only done for woff2 decompression.
This bumps the required C++ version from 11 to 20 to get std::span, but alternatively I could pull in a span implementation from somewhere else (e.g. Chromium).
This also adds a simple correctness "fuzzer" which takes input and then compresses/decompresses/re-compresses it, and checks the two compressed versions are equivalent.