Retroarch, add new device type in controls, "Analog Arcade Gun"

[AngeloScipione]

Now, Flycast in Retroarch is very cool because you can use device type "controller" to map two or more player with only one dolphin bar. With mode 3 and a nunchuck you can use IR sensor as a stick, that means when you move wiimote also move the cross.

However... It's tricky configure a "controller" for a lightgun and this "hidden feature" is missing for users. With an specific device type, it could be more visible this feature and more clean configuration.

[AngeloScipione]

Could it be something like: gun x-, gun x+, gun y-, gun y+, shoot, reload and something else for special cases.