Logitech G27 fixes and cleanups

[Kethen]

• revamp effect direction to avoid some windows driver issues
  • ref: Direct Input Haptic Issues with Thrustmaster T150 Steering Wheel libsdl-org/SDL#7941
• fix possible SDL_SetJoystickLED calls on closed joystick handle
• revamp ramp and variable effects
• various comment cleanups

[Megamouse]

can you remove those two functions since they seem to be unused?

static inline u16 axis_to_logitech_g27_steering(s16 axis)
{
	const u16 unsigned_axis = axis + 0x8000;
	return (unsigned_axis * (0xFFFF >> 2)) / 0xFFFF;
}

static inline u8 axis_to_logitech_g27_pedal(s16 axis)
{
	const u16 unsigned_axis = axis + 0x8000;
	return (unsigned_axis * (0xFF)) / 0xFFFF;
}