Added SDL_GetJoystickCaps() and SDL_GetGamepadCaps() to get the capabilities of controllers

Also added SDL_GAMEPAD_CAP_PLAYER_LED to let the application know if the controller has a visible player LED

src/joystick/darwin/SDL_iokitjoystick.c

@@ -918,7 +918,7 @@ static Uint32 DARWIN_JoystickGetCapabilities(SDL_Joystick *joystick)
     }
 
     if (device->ffservice) {
-        result |= SDL_JOYCAP_RUMBLE;
+        result |= SDL_JOYSTICK_CAP_RUMBLE;
     }
 
     return result;