Update versions, refactor auth, and add new constants

Updated assembly and file versions in `AssemblyInfo.cs` to `1.6.5.0`. Added `AuthUrl` and `AltAuthUrl` constants in `GlobalObjects.cs` and set `IsBeta` to `false`. Enhanced `TokenSwapAuth` class in `TokenSwapAuth.cs` with better organization, new using directives, and improved error handling. Refactored `TokenSwapAuthController` for readability. Modified `DoAuthAsync` in `SpotifyApiHandler.cs` to support an optional `altUrl` parameter. Added a null check in `RefreshAuthAsync` to handle token retrieval failures.

Songify Slim/Properties/AssemblyInfo.cs

@@ -50,7 +50,7 @@
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.6.4.7")]
-[assembly: AssemblyFileVersion("1.6.4.7")]
+[assembly: AssemblyVersion("1.6.5.0")]
+[assembly: AssemblyFileVersion("1.6.5.0")]
 [assembly: NeutralResourcesLanguage("en")]
 [assembly: Guid("442379e3-32d8-42d1-ab09-cba229672453")]

Songify Slim/Util/General/GlobalObjects.cs

@@ -22,12 +22,14 @@ public static class GlobalObjects
     {
         public const string ApiUrl = "https://api.songify.rocks/v2";
         public const string BaseUrl = "https://songify.overcode.tv";
+        public const string AuthUrl = "https://songify.overcode.tv";
+        public const string AltAuthUrl = "https://songify.bloemacher.com";
         public static string ApiResponse;
         public static string AppVersion;
         public static FlowDocument ConsoleDocument = new();
         public static TrackInfo CurrentSong;
         public static bool DetachConsole = false;
-        public static bool IsBeta = true;
+        public static bool IsBeta = false;
         public static bool IsInPlaylist;
         public static ObservableCollection<RequestObject> ReqList = new();
         public static string Requester = "";