add default APIs
add default APIs

* /device/id|all|num
retrieve information about available devices

* /counter/id|all|num
retrieve information about stats counters

libmoon/libmoon,scholzd/libmoon,libmoon/libmoon,emmericp/libmoon,libmoon/libmoon,scholzd/libmoon,emmericp/libmoon,emmericp/libmoon,scholzd/libmoon