emp-wasm

Work in progress compiling authenticated garbling from emp-toolkit/emp-ag2pc to wasm.

Currently this is just a stripped down version that you can compile with a single clang++ command (see build.sh).

Uncertain Refactors

For most of the changes I'm reasonably confident that I preserved behavior, but there some things I'm less confident about:

• send and recv swapped for bob in Fpre::generate (see TODO comment)
• after removing threading, I also moved everything to a single io channel
• rewrite of simd code to not use simd and updated aes usage written by chatgpt o1 preview

Regardless, this version of emp-toolkit needs some checking.