Feature: Add f_network_to_ip_string() and f_network_from_ip_string() functions.

Feature: Add f_network_to_ip_string() and f_network_from_ip_string() functions.

Provide support for inet_ntop() and inet_pton().

String are handling in FLL via f_string_static_t and f_string_dynamic_t.
The functions f_network_to_ip_string() and f_network_from_ip_string() are written to convert to these string types.

This implements a custom f_network_family_ip_t type to pass the digit IP address.
The idea here is to help reduce how much the FLL API is locked into the "libc" or POSIX API.

The structures are allocated using "{ 0 }" to take advantage of the supposed relatively new feature that treats this as an initialize all to NULL.