Rust bindings for libCwtch
Example echobot in examples/echobot.rs (cargo run --example echobot -- assumes tor is on $PATH)
cargo install bindgenlibCwtch.so version is specified in build.rs. If updating, also download the corresponding libCwtch.h and delete the 'preamble from import "C"' section as it imports headers required for the C lib to compile but that we don't want to create rust bindings for (like importing stdlib.h). Then:
bindgen libCwtch.h -o src/cwtchlib_go/bindings.rs