Basically changing from
https://www.rfc-editor.org/rfc/rfc4034.html#section-2.1 to https://www.rfc-editor.org/rfc/rfc4034.html#section-5.1

So:
flags -> key_tag
protocol -> algorithm
algorithm -> digest_type
public_key -> digest

Include only existent yaml sources, fixes #1066

v1.1.1 version bump and changelog update

Fix typo when loading auto-arpa config

v1.1.0 version bump & changelog update

Resolved a typo that prevented the auto-arpa configuration options from
loading.

Meta processor

Spf deprecations

Add support for !include YAML directive

Preferable to have it run later after other processors have had their
change to add/remove records. Otherwise there may be PTRs created for
things that processors have filtered out. It's always possible to
manually include it in the appropriate places if you need finger grained
control.

Add a Processors list/section to the README

YamlProvider support for shared file, loaded into all zones

Deprecate SplitYamlProvider, subsume functionality into YamlProvider w/a refactor

This reverts commit 6f39fcc5f7.

Add octodns-spf to the README

Record's carry context, Zone exceptions make use of it to help with error messages