Retroplayer4 - Improvements

# Change joystick input under linux to alphabetically read the joystick interfaces
Because the xbox 360 wireless receiver creates 4 joystick-interfaces and on my ion machine the connected joystick is used as joystick3 (although it is js0 in the filesystem) and because there is no joystick selection it will not be used in retoplayer

# Implemented suspend - resume on joystick manager under linux