Add sentry logging

osu.Desktop/Program.cs

@@ -4,7 +4,10 @@
 using System;
 using System.IO;
 using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
 using osu.Framework;
+using osu.Framework.Logging;
 using osu.Framework.Platform;
 using osu.Game.IPC;
 
@@ -20,6 +23,8 @@ namespace osu.Desktop
 
             using (DesktopGameHost host = Host.GetSuitableHost(@"osu", true))
             {
+                host.ExceptionThrown += handleException;
+
                 if (!host.IsPrimaryInstance)
                 {
                     var importer = new ArchiveImportIPCChannel(host);
@@ -45,5 +50,22 @@ namespace osu.Desktop
                 return 0;
             }
         }
+
+        private static int allowableExceptions = 1;
+
+        /// <summary>
+        /// Allow a maximum of one unhandled exception, per second of execution.
+        /// </summary>
+        /// <param name="arg"></param>
+        /// <returns></returns>
+        private static bool handleException(Exception arg)
+        {
+            bool continueExecution = Interlocked.Decrement(ref allowableExceptions) >= 0;
+
+            Logger.Log($"Unhandled exception has been {(continueExecution ? "allowed" : "denied")} with {allowableExceptions} more allowable exceptions.");
+
+            Task.Delay(1000).ContinueWith(_ => Interlocked.Increment(ref allowableExceptions));
+            return Interlocked.Decrement(ref allowableExceptions) >= 0;
+        }
     }
 }