client area position is used in SetSize; changes for BC++ & VC++ 1.5;
wxWindow::GetUpdateRegion added; removed wxUpdateIterator; some missing functions
added to process.cpp; bad navigation key event cast fixed; MDI and toolbar samples
updated; new wxMSW wxRegion constructor (WXHRGN)
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@376 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775