QWS Kebyoard driver blocks console

When using QWS_KEYBOARD="[USB|LinuxInput]:/dev/.." the serial console does block any output after creating the QApplication object.

The reason is a terminal setting which is only useful for QWS_KEYBOARD="tty:/dev/tty0", since it blocks all keys with the argument, that CTRL+C should not kill the application when trying to copy text. When using an USB-keyboard, you will never have the keyboard input on your tty (on embedded systems).

See attached patch (not tested).

For the workaround I just undo the TTY modifications:

		// Save terminal settings
		int m_tty_fd = 0;
		struct ::termios termdata;
		tcgetattr(m_tty_fd, &termdata);

		QApplication app( argc, argv, QApplication::GuiServer );

		// Restore terminal settings
		tcsetattr(m_tty_fd, TCSANOW, &termdata);