Windows debugger: Load the dialogs on demand.

I think this is especially good for the Ge dialog since we now can avoid
initializing that extra GL context unless you open the dialog.

Windows/Debugger/Debugger_Disasm.cpp

@@ -899,7 +899,8 @@ void CDisasm::UpdateDialog(bool _bComplete)
 		_snwprintf(tempTicks, 24, L"%lld", CoreTiming::GetTicks() - lastTicks);
 		SetDlgItemText(m_hDlg, IDC_DEBUG_COUNT, tempTicks);
 	}
-	// Update Register Dialog
+
+	// Update memory window
 	if (memoryWindow)
 		memoryWindow->Update();