Added image/video control and property manipulation

src/main/java/org/openautonomousconnection/luascript/hosts/DomHost.java

@@ -147,4 +147,19 @@ public interface DomHost {
      * @return list of ids (never null)
      */
     List<String> queryByClass(String className);
+
+    /**
+     * Sets a DOM property (e.g. video.currentTime, video.volume).
+     */
+    void setProperty(String elementId, String property, Object value);
+
+    /**
+     * Gets a DOM property.
+     */
+    Object getProperty(String elementId, String property);
+
+    /**
+     * Invokes a DOM method (e.g. video.play()).
+     */
+    Object call(String elementId, String method, Object... args);
 }