Rust error handling

[sneurlax]

Catch panics and make sure Rust doesn’t unwind across the FFI boundary
https://docs.rs/ffi_helpers/latest/ffi_helpers/panic/fn.catch_panic.html and attempt to catch errors as in https://docs.rs/ffi_helpers/latest/ffi_helpers/panic/fn.recover_panic_message.html

Handle errors as in https://docs.rs/ffi_helpers/latest/ffi_helpers/error_handling/index.html