use functions to handle colors in Windows GUI terminal * QWinTerminalImpl.cpp (QConsolePrivate::backgroundColor, QConsolePrivate::foregroundColor, QConsolePrivate::selectionColor, QConsolePrivate::cursorColor, QConsolePrivate::setBackgroundColor, QConsolePrivate::setForegroundColor, QConsolePrivate::setSelectionColor, QConsolePrivate::setCursorColor): New functions. (QConsolePrivate::m_backgroundColor, QConsolePrivate::m_foregroundColor): Delete member variables. (QConsolePrivate::QConsolePrivate): Call setBackgroundColor and setForegroundColor to set default colors. (QWinTerminalImpl::viewPaintEvent): Use functions to access colors.