Hookgen creates events that are impossible to subscribe to

Description

If the original dll has a private struct with methods, then HookGen creates events to Hook those methods, but it's impossible to subscribe to those events.

Example

There's a type in Hollow Knight that looks like

public class HealthManager
{
  private struct HPScaleGG
  {
    public int GetScaledHP()
    {
      // Code goes here
    }
  }
}

HookGen creates the event On.HealthManager.HPScaleGG.GetScaledHP of type delegate int hook_GetScaledHP(... orig, ref ValueType self). But this event is unhookable, because the HookEndpointManager is expecting a parameter of type ref HealthManager.HPScaleGG which is not compatible with ref ValueType.

I'm not entirely sure what the best fix would be, but I feel that not creating the event is probably better than creating an event that can't be hooked.