pfSense

Code style and white space in etc

Add DynDNS provider SPDNS (IPv4 and IPv6)

SPDNS is a free DynDNS service from the German company Securepoint
Security Solutions

add server response to failed updates; make debugging much easier

etc inc delete $Id comments

and bits of white space.
Note: There are plenty of files still with old-format copyright sections
in here.

Do curl_init above any curl_setopt, and take it out of that if block since it applies to all types.

Where doing a dynamic DNS update on IPv4, force curl to resolve IPv4 IPs. Ticket #3858

Fix typo

Use the appropriate parent interface with gateway groups using CARP VIPs.
Ticket #4990

Disable DHS as a dynamic DNS provider option. It's never worked, and
fixing is more complex than just fixing the variable screw up and
disabling cert validation for their SSLLabs F-graded site. Updates made on
their site even take quite some time to be reflected, seems to be a...

GratisDNS support for hosts without subdomains

Resubmit of #1793

Fix Cloudflare support for Dynamic DNS Updates

Resubmit of #1812

The current implementation isn't working due to API change. Credits: det0nat3 @ https://forum.pfsense.org/index.php?topic=87436.msg534817#msg534817

Move main pfSense content to src/