Delete everything, I'm redesigning this.•••I'll stop using a flat package and make things much more modular.
And also experiment with streaming APIs so large blobs don't OOM us.
Revert "adler32: Drop SSE3 support"•••This reverts commit ba327e76c5b110044ec8ebb75630e79506dfbed8 and re-adds
SSE3 support at the request of Noisytoot.