Added image/video control and property manipulation

src/main/java/org/openautonomousconnection/luascript/fx/MediaExtensions.java

@@ -0,0 +1,34 @@
+package org.openautonomousconnection.luascript.fx;
+
+import java.util.Locale;
+
+/**
+ * Shared extension helper for media sources.
+ */
+public final class MediaExtensions {
+
+    /**
+     * Extracts a lower-case extension without dot, or empty string if none.
+     *
+     * @param pathOrName path or file name
+     * @return extension without dot, lower-case, or empty string
+     */
+    public static String extensionOf(String pathOrName) {
+        if (pathOrName == null) return "";
+        String s = pathOrName.trim();
+        if (s.isEmpty()) return "";
+
+        int q = s.indexOf('?');
+        if (q >= 0) s = s.substring(0, q);
+        int h = s.indexOf('#');
+        if (h >= 0) s = s.substring(0, h);
+
+        int slash = Math.max(s.lastIndexOf('/'), s.lastIndexOf('\\'));
+        String name = (slash >= 0) ? s.substring(slash + 1) : s;
+
+        int dot = name.lastIndexOf('.');
+        if (dot < 0 || dot == name.length() - 1) return "";
+
+        return name.substring(dot + 1).toLowerCase(Locale.ROOT);
+    }
+}