[New] Added ThreadHelper with sleep() without throws

li.strolch.utils/src/main/java/li/strolch/utils/ThreadHelper.java

@@ -0,0 +1,12 @@
+package li.strolch.utils;
+
+public class ThreadHelper {
+
+	public static void sleep(long millis) {
+		try {
+			Thread.sleep(millis);
+		} catch (InterruptedException e) {
+			throw new IllegalStateException(e);
+		}
+	}
+}