added new tiles and actions:

* Tile displaying text
* TextDisplay: an action that sends text to clients
* DetermineTrainInBlock: action that alters the context by requesting the train in a specific block

src/main/java/de/srsoftware/web4rail/actions/ShowText.java

@@ -0,0 +1,23 @@
+package de.srsoftware.web4rail.actions;
+
+import de.srsoftware.web4rail.tags.Label;
+
+public class ShowText extends TextAction{
+
+
+	@Override
+	public boolean fire(Context context) {
+		plan.stream(fill(text,context));
+		return true;
+	}
+
+	@Override
+	protected Label label() {
+		return new Label(t("Text to display on clients:")+NBSP);
+	}
+	
+	@Override
+	public String toString() {
+		return t("Display \"{}\" on clients.",text);
+	}
+}