added serial-out support to emulator + serial lib & command line mode for dsa emulator

emulator/src/main.rs

@@ -1,9 +1,15 @@
+use std::env;
 use std::path::Path;
 use std::sync::Arc;
 
 use dsa_rs::emulator::{config::Config, misc::rpc::get_rpc_client_or_none};
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
+    if env::args().any(|arg| arg == "--cli") {
+        dsa_rs::emulator::cli::run_cli()?;
+        std::process::exit(0);
+    }
+
     // Initialize channels and read in configuration.
     let (cmd_sender, cmd_receiver) = std::sync::mpsc::channel();
     let (state_sender, state_reciever) = std::sync::mpsc::channel();