add events for AppDomain creation and destruction in Debugger

src/AddIns/Debugger/Debugger.Core/ManagedCallback.cs

@@ -352,7 +352,9 @@ namespace Debugger
 			EnterCallback("CreateAppDomain", pAppDomain);
 
 			pAppDomain.Attach();
-			process.appDomains.Add(new AppDomain(process, pAppDomain));
+			AppDomain appDomain = new AppDomain(process, pAppDomain);
+			process.appDomains.Add(appDomain);
+			process.OnAppDomainCreated(appDomain);
 
 			ExitCallback();
 		}
@@ -475,7 +477,9 @@ namespace Debugger
 		{
 			EnterCallback("ExitAppDomain", pAppDomain);
 			
-			process.appDomains.Remove(process.GetAppDomain(pAppDomain));
+			AppDomain appDomain = process.GetAppDomain(pAppDomain);
+			process.appDomains.Remove(appDomain);
+			process.OnAppDomainDestroyed(appDomain);
 			
 			ExitCallback();
 		}

src/AddIns/Debugger/Debugger.Core/NDebugger.cs

@@ -346,6 +346,18 @@ namespace Debugger
 		}
 	}
 	
+	[Serializable]
+	public class AppDomainEventArgs: DebuggerEventArgs
+	{
+		public AppDomain AppDomain { get; private set; }
+		
+		public AppDomainEventArgs(AppDomain appDomain)
+		{
+			this.Process = appDomain.Process;
+			this.AppDomain = appDomain;
+		}
+	}
+	
 	[Serializable]
 	public class MessageEventArgs : EventArgs
 	{

src/AddIns/Debugger/Debugger.Core/Process.cs

@@ -32,6 +32,8 @@ namespace Debugger
 		public event EventHandler<MessageEventArgs> LogMessage;
 		public event EventHandler<ModuleEventArgs> ModuleLoaded;
 		public event EventHandler<ModuleEventArgs> ModuleUnloaded;
+		public event EventHandler<AppDomainEventArgs> AppDomainCreated;
+		public event EventHandler<AppDomainEventArgs> AppDomainDestroyed;
 		public event EventHandler<DebuggerPausedEventArgs> Paused;
 		public event EventHandler<DebuggerEventArgs> Resumed;
 		public event EventHandler<DebuggerEventArgs> Exited;
@@ -603,5 +605,15 @@ namespace Debugger
 		}
 		
 		#endregion
+		
+		internal void OnAppDomainCreated(AppDomain appDomain)
+		{
+			
+		}
+		
+		internal void OnAppDomainDestroyed(AppDomain appDomain)
+		{
+			
+		}
 	}
 }