UI: Compatibility List Viewer

src/Ryujinx/Utilities/Compat/CompatibilityHelper.cs

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+using Gommon;
+using nietras.SeparatedValues;
+using Ryujinx.Common.Configuration;
+using System.Net.Http;
+using System.Threading.Tasks;
+
+namespace Ryujinx.Ava.Utilities.Compat
+{
+    public static class CompatibilityHelper
+    {
+        private static readonly string _downloadUrl =
+            "https://gist.githubusercontent.com/ezhevita/b41ed3bf64d0cc01269cab036e884f3d/raw/002b1a1c1a5f7a83276625e8c479c987a5f5b722/Ryujinx%2520Games%2520List%2520Compatibility.csv";
+        
+        private static readonly FilePath _compatCsvPath = new FilePath(AppDataManager.BaseDirPath) / "system" / "compatibility.csv";
+
+        public static async Task<SepReader> DownloadAsync()
+        {
+            if (_compatCsvPath.ExistsAsFile)
+                return Sep.Reader().FromFile(_compatCsvPath.Path);
+            
+            using var httpClient = new HttpClient();
+            var compatCsv = await httpClient.GetStringAsync(_downloadUrl);
+            _compatCsvPath.WriteAllText(compatCsv);
+            return Sep.Reader().FromText(compatCsv);
+        }
+
+        public static async Task InitAsync()
+        {
+            CompatibilityCsv.Shared = new CompatibilityCsv(await DownloadAsync());
+        }
+    }
+}