Add RUI3 AT command AT+FIRMWAREVER
Add option to set application version with
snprintf(g_custom_fw_ver,63,"RAK11200 ENV V%d.%d.%d",SW_VERSION_1,SW_VERSION_2,SW_VERSION_3);
AT+VER=? command will show WisBlock API V2 version
AT+FIRMWAREVER=? command will show application version. Defaults to "Custom firmware"