Support for Allowing/Denying IP and Subnet Addresses

[Badgerati]

The idea behind this is to allow IP address and subnet masks to be allowed/denied, and any incoming requests that meet the requirement are allowed or denied access.

This will be under a new keyword of access to be used within the Server, examples include:

# allowing the local ip
access allow ip 127.0.0.1

# allow a subnet, will allow everything 10.10.0.0 - 10.10.0.255
access allow ip '10.10.0.0/24'

# deny an array of ips
access deny ip @('192.168.1.2', '192.168.1.3')

# deny every address
access deny ip all

The allow list is checked first, followed by the deny list. If the IP is in neither but we have an allow list then auto-deny the IP.

Feature can maybe be extended later on to support content types (ie: access allow content 'text/plain')