Restructure files & remove unused code & simplify few statements

src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/model/AttributeConfig.java

@@ -0,0 +1,28 @@
+package at.pcgamingfreaks.mkvaudiosubtitlechanger.model;
+
+import lombok.Getter;
+import lombok.extern.log4j.Log4j2;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+@Log4j2
+@Getter
+public class AttributeConfig {
+    private List<String> audio;
+    private List<String> subtitle;
+
+    public AttributeConfig(List<String> audio, List<String> subtitle) {
+        this.audio = audio;
+        this.subtitle = subtitle;
+    }
+
+    @Override
+    public String toString() {
+        final StringBuffer sb = new StringBuffer("AttributeConfig{");
+        sb.append("audio=").append(String.join(", ", audio));
+        sb.append(", subtitle=").append(String.join(", ", subtitle));
+        sb.append('}');
+        return sb.toString();
+    }
+}