Add setting to skip CDN requesting

Author: Marlamin

TACTSharp/CDN.cs

@@ -199,6 +199,9 @@ public async Task<string> GetPatchServiceFile(string product, string file = "ver
                 }
             }
 
+            if (!Settings.TryCDN)
+                throw new FileNotFoundException();
+
             for (var i = 0; i < CDNServers.Count; i++)
             {
                 var url = $"http://{CDNServers[i]}/{ProductDirectory}/{type}/{hash[0]}{hash[1]}/{hash[2]}{hash[3]}/{hash}";
@@ -340,6 +343,9 @@ public unsafe bool TryGetLocalFile(string eKey, out ReadOnlySpan<byte> data)
                 }
             }
 
+            if (!Settings.TryCDN)
+                throw new FileNotFoundException();
+
             lock (cdnLock)
             {
                 if (CDNServers.Count == 0)

TACTSharp/Settings.cs

@@ -12,6 +12,7 @@ public class Settings
         public string CacheDir = "cache";
         public string CDNDir = "";
         public bool ListfileFallback = true;
+        public bool TryCDN = true;
         public string ListfileURL = "https://github.com/wowdev/wow-listfile/releases/latest/download/community-listfile.csv";
     }
 }