added getParams method to Params

pom.xml

@@ -4,7 +4,7 @@
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>de.srsoftware</groupId>
 	<artifactId>web4rail</artifactId>
-	<version>1.4.39</version>
+	<version>1.4.40</version>
 	<name>Web4Rail</name>
 	<packaging>jar</packaging>
 	<description>Java Model Railway Control</description>

src/main/java/de/srsoftware/web4rail/Params.java

@@ -28,4 +28,10 @@ public class Params extends HashMap<String, Object> {
 			return null;
 		}
 	}
+
+	public Params getParams(Object key) {
+		Object v = super.get(key);
+		if (v instanceof Params) return (Params) v;		
+		return null;
+	}
 }