add check for duplicate controller/replay registration

Nodsoft.WowsReplaysUnpack/ReplayUnpackerBuilder.cs

@@ -53,6 +53,17 @@ public ReplayUnpackerBuilder AddReplayController<TController, TReplay>()
 		where TController : class, IReplayController<TReplay>
 		where TReplay : UnpackedReplay, new()
 	{
+		ServiceDescriptor[] existingControllers = Services.Where(s =>
+				s.ServiceType.IsGenericType &&
+				s.ServiceType.GetGenericTypeDefinition() == typeof(IReplayController<>))
+			.ToArray();
+
+		foreach (ServiceDescriptor existingController in existingControllers)
+		{
+			if (existingController.ServiceType.GenericTypeArguments[0] == typeof(TReplay))
+				throw new Exception("There can only be one controller per replay type registered");
+		}
+
 		Services.AddScoped<IReplayUnpackerService<TReplay>, ReplayUnpackerService<TReplay>>();
 		Services.AddScoped<IReplayController<TReplay>, TController>();
 		return this;

README.md

@@ -69,6 +69,8 @@ Responsible for handling parsed network packets and filling the UnpackedReplay w
 
 Your custom replay controller has to implement `IReplayController` but it is strongly suggested 
 to use `ReplayControllerBase<T>` where T is your custom replay class.
+Only one controller can be registered for any replay type.
+~~~~
 An example of this is the [ExtendedDataController](Nodsoft.WowsReplaysUnpack.ExtendedData/ExtendedDataController.cs).
 
 To use your custom controller add the replay type to the `GetUnpacker()` method.