Allow using zlib-rs for more than 2x speedup and improved memory safety #29
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Switches over to zlib-rs by default. On my machine this improves the reported time by
mtpngCLI from 128ms to 55ms on this image: https://commons.wikimedia.org/wiki/File:Diagram_Integrasi_Transportasi_Publik_Semarang.pngAllows selecting plain old zlib via Cargo features just in case it's needed for some sort of C program linking not to blow up. I don't actually know if they will blow up or not, so I decided to err on the side of caution.