Maybe memory leak in qgoodwindow

[hcaihao]

[antonypro]

Hi, @hcaihao!

After you pointed me the memory leak, i found that QGoodWindow isn't releasing properly all of it's memory allocated objects.

Some changes were made on version 2.4.4 beta3 to fix this problem:

QGoodWindow/QGoodWindow-2.4.4-beta3/QGoodWindow/src/qgoodwindow.cpp

Lines 557 to 564 in 40cb47a

	if (m_window_handle)
	{
	delete m_window_handle;
	m_window_handle = nullptr;
	}
	DestroyWindow(m_hwnd);
	UnregisterClassW(L"QGoodWindowClass", GetModuleHandleW(nullptr));