made some preferences configurable

core/src/main/java/de/srsoftware/umbrella/core/Util.java

@@ -21,6 +21,16 @@ public class Util {
 	public static final System.Logger LOG = System.getLogger("Util");
 	private Util(){}
 
+	public static System.Logger.Level mapLogLevel(String lbl) {
+		return switch (lbl){
+			case "ERROR" -> ERROR;
+			case "WARN" -> WARNING;
+			case "DEBUG" -> DEBUG;
+			case "TRACE" -> TRACE;
+			default -> INFO;
+		};
+	}
+
 	public static HttpURLConnection open(URL url) throws IOException {
 		var conn = (HttpURLConnection) url.openConnection();
 		conn.setRequestProperty("Accept","*/*");