NadekoBot.Extensions should now be fully annotated with nullable reference types as well as many classes from NadekoBot.Common

src/NadekoBot/Modules/Games/Common/TicTacToe.cs

@@ -1,4 +1,5 @@
-using System.Text;
+#nullable disable
+using System.Text;
 using CommandLine;
 
 namespace NadekoBot.Modules.Games.Common;
@@ -281,4 +282,4 @@ public class TicTacToe
 
         return Task.CompletedTask;
     }
-}
+}