Added Admin parameter for opening printer connection with administrative rights.
Split WindowsPrinterMBS class and created WindowsPrinterInfoMBS class. WindowsPrinterMBS is now the class for an open printer. This way we avoid to open a connection for each operation and simply open it once with OpenPrinter method.
Added WindowsPrinterInfoMBS class.
Added NSControlMBS.SetStringValue method.
Added functions WinApplyDevModeMBS, WindowsGraphicsInfoMBS, WinEndPageMBS and WinStartPageMBS to Graphics class.