Add DevtestCommand to easily test without restarting server

src/main/java/client/command/commands/gm6/DevtestCommand.java

@@ -0,0 +1,40 @@
+package client.command.commands.gm6;
+
+import client.Client;
+import client.command.Command;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import scripting.AbstractScriptManager;
+
+import javax.script.Invocable;
+import javax.script.ScriptEngine;
+import javax.script.ScriptException;
+
+public class DevtestCommand extends Command {
+    {
+        setDescription("Runs devtest.js. Developer utility - test stuff without restarting the server.");
+    }
+
+    private static final Logger log = LoggerFactory.getLogger(DevtestCommand.class);
+
+    private static class DevtestScriptManager extends AbstractScriptManager {
+
+        @Override
+        public ScriptEngine getInvocableScriptEngine(String path) {
+            return super.getInvocableScriptEngine(path);
+        }
+
+    }
+
+    @Override
+    public void execute(Client client, String[] params) {
+        DevtestScriptManager scriptManager = new DevtestScriptManager();
+        ScriptEngine scriptEngine = scriptManager.getInvocableScriptEngine("devtest.js");
+        try {
+            Invocable invocable = (Invocable) scriptEngine;
+            invocable.invokeFunction("run", client.getPlayer());
+        } catch (ScriptException | NoSuchMethodException e) {
+            log.info("devtest.js run() threw an exception", e);
+        }
+    }
+}