Support setting output encoding in exec/execTask #582
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This change mirrors the exec/execFile Node API and lets us pass
encoding: bufferto exec/execTask in order to receive stdout/stderr as buffers (instead of strings). This is important when dealing with huge outputs where it might not be possible to convert the entire output to a string (due to V8 string memory limits) and we might need to either stream (already possible usingspawn) or grab the entire output as a Buffer which we can then parse into smaller chunks (strings).