Debug RGBDS with a fuzzer (afl? libfuzzer?)

[ISSOtm]

meithecatte did it back then I think with AFL, but LLVM also has libfuzzer, which seems to be easier to set up.

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Basic setup:

• Build the programs as a library (i.e., no main)
• Create the fuzzer entry point (int LLVMFuzzerTestOneInput (const unsigned char *, size_t); must accept any input, run it and return 0)
• Link the whole thing and build with -fsanitize=fuzzer and you're done: the resulting binary fuzzes the program