Neglected automatic default values for static IP configuration

[JAndrassy]

The Arduino Ethernet library allows for users to only to specify the IP address for static IP configuration. There are versions of begin for static IP with only IP, with IP and DNS IP, with IP, DNS IP and gateway and the last version adds a parameter for mask. The methods with few parameters create default values for the missing parameters. Default value for mask is 255.255.255.0, default value for DNS IP and gateway IP is based on the IP address with last byte changed to 1.

The first WiFi library has versions of config like the Ethernet library has versions of begin for static IP, but the default values are not set in the library and neither in the firmware. The address stays 0.0.0.0 so the versions of config with less parameters don't work. WiFi101 and WiFiNINA copied this error. (my PR are waiting to fix it) The new WiFiS3 library has it right so I guess it confirms it as a feature of the API.

esp8266 and esp32 WiFi library don't have versions of config for default values of DNS IP, gateway IP and mask.

My libraries of course have this feature, because I think it is useful. The default values are good for most of the networks.

What is your opinion?