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/TextAction.java

@@ -0,0 +1,66 @@
+package de.srsoftware.web4rail.actions;
+
+import java.util.HashMap;
+
+import org.json.JSONObject;
+
+import de.srsoftware.tools.Tag;
+import de.srsoftware.web4rail.Window;
+import de.srsoftware.web4rail.tags.Button;
+import de.srsoftware.web4rail.tags.Form;
+import de.srsoftware.web4rail.tags.Input;
+import de.srsoftware.web4rail.tags.Label;
+
+public abstract class TextAction extends Action {
+	
+	public static final String TEXT = "text";
+	protected String text = "Hello, world!";
+
+
+	public String fill(String tx,Context context) {
+		if (isSet(context.block)) tx = tx.replace("%block%", context.block.name);
+		if (isSet(context.contact)) tx = tx.replace("%contact%", context.contact.id());
+		if (isSet(context.direction)) tx = tx.replace("%dir%", context.direction.name());
+		if (isSet(context.route)) tx = tx.replace("%route%", context.route.name());
+		if (isSet(context.train)) tx = tx.replace("%train%", context.train.name());		
+		return tx;
+	}
+	
+	@Override
+	public JSONObject json() {
+		JSONObject json = super.json();
+		json.put(TEXT, text);
+		return json;
+	}
+	
+	protected abstract Label label();
+
+	@Override
+	public Action load(JSONObject json) {
+		super.load(json);
+		text = json.getString(TEXT);
+		return this;	
+	}
+	
+	@Override
+	public Window properties(HashMap<String, String> params) {
+		Window win = super.properties(params);
+		Form form = new Form("action-prop-form-"+id);
+		new Input(REALM,REALM_ACTIONS).hideIn(form);
+		new Input(ID,params.get(ID)).hideIn(form);
+		new Input(ACTION,ACTION_UPDATE).hideIn(form);
+		new Input(CONTEXT,params.get(CONTEXT)).hideIn(form);
+		new Input(TEXT, text).addTo(label()).addTo(form);
+		new Button(t("Apply"),form).addTo(form).addTo(win);		
+		return win;
+	}
+	
+	@Override
+	protected Object update(HashMap<String, String> params) {
+		LOG.debug("update: {}",params);
+		String error = null;
+		text = params.get(TEXT);
+		Window win = properties(params);
+		return new Tag("span").content(error).addTo(win);
+	}
+}