Initial fuzzing support, still images only #23
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Finds panics already when seeded with AFL's edges-only WebP corpus taken from https://lcamtuf.coredump.cx/afl/demo/
This could use some optimizations to avoid zeroing a big buffer anew on every iteration, especially on images that advertise dimensions close to 2GB in size. But we'll need to fix the panics before I can run it long enough to measure its performance.
Part of #22