Jai bindings for libsodium v1.0.20.

Windows/MacOS/Linux: We link statically, simply import and run.

The current bindings and included C headers are for libsodium version 1.0.20. If you don't plan to run generate.jai, you can delete generate.jai and the include directory.

Most libsodium procedures have a crypto_* prefix, like crypto_hash_sha256, but we strip that prefix, so instead you just use hash_sha256.

Note that a few constants like crypto_hash_sha256_BYTES still have the prefix (need to find a way to configure Bindings_Generator to do that!).