Add note that this is unsafe to run on untrusted files.

[GnomedDev]

After running wszst (de)compress through a fuzzer for a little while, it became obvious that SIGSEGV crashes are quite evident. I can send you the crashing files if you want, but seeing that this is a big ball of C code I don't believe it should be trusted to accept untrusted files.

My motivation for this is that I was going to run this on a server for uploading track files, and using wszst sha1 to grab the hash of a track, but after testing I found that this was a big security risk and instead opted to use my rust rewrite of wbz decompression to decompress and calculate the hash.