implement ListDevices command and use it in usbmuxd_get_device_list()
implement ListDevices command and use it in usbmuxd_get_device_list()

fishjam/libusbmuxd,libimobiledevice/libusbmuxd,libimobiledevice-win32/libusbmuxd,wangwei1237/libusbmuxd,aburgh/libusbmuxd,wangwei1237/libusbmuxd,fishjam/libusbmuxd,libimobiledevice/libusbmuxd,aburgh/libusbmuxd,libimobiledevice-win32/libusbmuxd