[windows] add binding exceptions messagebox notifications, update exceptions handling code

Signed-off-by: R4SAS <r4sas@i2pmail.org>

Win32/Win32App.cpp

@@ -432,7 +432,7 @@ namespace win32
 		HWND hWnd = FindWindow (I2PD_WIN32_CLASSNAME, TEXT("i2pd"));
 		if (hWnd)
 			PostMessage (hWnd, WM_COMMAND, MAKEWPARAM(ID_EXIT, 0), 0);
-		UnSubscribeFromEvents();
+		// UnSubscribeFromEvents(); // TODO: understand why unsubscribing crashes app
 		UnregisterClass (I2PD_WIN32_CLASSNAME, GetModuleHandle(NULL));
 	}
 
@@ -451,6 +451,5 @@ namespace win32
 			PostMessage (hWnd, WM_COMMAND, MAKEWPARAM(ID_STOP_GRACEFUL_SHUTDOWN, 0), 0);
 		return hWnd;
 	}
-
 }
 }