Create persistent devices for xbox 360 wireless controllers

[ajw1980]

This is a feature request to add in the ability for the wireless receiver to maintain persistent devices for the wireless controllers. I know this behavior was there before and this driver now dynamically adds and removes devices as controllers are connected and disconnected. The problem is that the wireless controllers tend to disconnect at undesired times. If they get banged too much or batteries need to be changed or sometimes even excessive rumble can cause them to turn off which means the input device gets removed. There are a lot of games that don't handle the device disconnecting well. The game freezes or controller input no longer works or other bad behavior occurs. Maybe there could be a driver option like create_persistent_devices=N with a range from 0-4, where 0 is the default and reflects the current dynamic behavior and 1-4 would create N number of persistent devices when the wireless receiver is detected.

[paroj]

for reference https://github.com/paroj/xpad/issues/5