feat(statemachine): 🚧 first draft of new xstate based statemachine implementation

Replaces the old statemachine.
Done so far:
- Basic command interface
- Machine saving and loading
- Sample dummy machine

lib/plugins/command.js

@@ -404,6 +404,16 @@ function command(username, message) {
                             break
                     }
                     break;
+                case "sm":
+                case "step":
+                    cfg.plugins.statemachine?.command?.(
+                        message_parts[0] == "sm" ? message_parts.slice(1) : message_parts, player
+                    )
+                        // TODO refactor into plugin detection and command exec function
+                        // safecommand(plugin_name, message_parts, player)
+                        // message_parts includes command?
+                        || bot.chat("statemachine plugin not loaded")
+                    break
                 case "location":
                     // TODO put in /lib/location
                     switch (message_parts[1]) {