input echo

src/engine/commands/echo.js

@@ -0,0 +1,8 @@
+export default function EchoCommand(args, context) {
+    if (args[1] != "on" && args[1] != "off") {
+        context.print(`Usage: echo <on/off>`);
+    } else {
+        context.setInputEcho(args[1] == "on" ? true : false);
+        context.print(`Command echo is now ${args[1]}`);
+    }
+}