PetNames: Known property names

[Current list at https://codeberg.org/skyguy/petnames/known_props.txt]

Properties starting with 'b_' are treated as bytes, otherwise strings.
Case is irrelevant - comparisons are case-insensitive

suggested_name
    Suggested name to use when storing this PetName
ttl_secs
    Duration to regard PetName data as valid (time-to-live)
b_lxmf_dh0
    Reticulum LXMF destination address
b_nomadnet_dh0
     Reticulum Nomadnet destination
b_reti_rnsh_dh0
     Reticulum rnsh destination
b_reti_rnx_dh0
    Reticulum rnx destination
b_ygg_ip6
    Yggdrasil IPv6 address
b_ygg_id
    Yggdrasil node address
