Support serialization of IPAddress and IPEndPoint. They will be represented as strings in the database.

Examples (dotted quad notation for IPv4 and colon-hexadecimal notation for IPv6):

IPAddress serializes to:"1.2.3.4" (IPv6 IPAddress serializes to: "1:2:3:4:5:7:8")
IPEndPoint serializes to: "1.2.3.4:9999" (IPv6 IPEndPoint serializes to: "[1:2:3:4:5:7:8]:9999")

These will always be numeric addresses.