Adds app whitelabling feature from kmountainflower site dumps

lib/kryz_audio_handler.dart

@@ -6,6 +6,7 @@ import 'package:audio_session/audio_session.dart';
 import 'package:http/http.dart' as http;
 import 'package:just_audio/just_audio.dart';
 
+import 'generated/app_config.dart';
 import 'live_info_business_object.dart';
 
 class KryzAudioHandler extends BaseAudioHandler with SeekHandler {
@@ -16,16 +17,16 @@ class KryzAudioHandler extends BaseAudioHandler with SeekHandler {
     );
   }
 
-  static const String streamUrl = 'https://kryz.out.airtime.pro/kryz_a';
+  static const String streamUrl = AppConfig.streamUrl;
   static const String mediaId = 'kryz-live-stream';
-  static const String _liveInfoEndpoint = 'http://kryz.airtime.pro/api/live-info';
+  static const String _liveInfoEndpoint = AppConfig.metadataUrl ?? '';
   static const Duration _liveInfoTimeout = Duration(seconds: 8);
   static const Duration _metadataRefreshInterval = Duration(seconds: 20);
 
   static const MediaItem _defaultMediaItem = MediaItem(
     id: mediaId,
-    title: 'KRYZ Live Stream',
-    artist: 'KRYZ Radio',
+    title: AppConfig.defaultTitle,
+    artist: AppConfig.defaultArtist,
     album: 'Live',
     extras: <String, dynamic>{
       'isLive': true,
@@ -52,7 +53,7 @@ class KryzAudioHandler extends BaseAudioHandler with SeekHandler {
       MediaItem(
         id: mediaId,
         title: current.displayTitle,
-        artist: subtitle.isEmpty ? 'KRYZ Radio' : subtitle,
+        artist: subtitle.isEmpty ? AppConfig.defaultArtist : subtitle,
         album: 'Live',
         extras: <String, dynamic>{
           'isLive': true,