Allow proto to be specified for powerdns

This allows a scheme to be set for the PowerDNS API. It defaults to
http to retain backwards compatibility.

Improved/actionable keys out of order error message

Release v0.8.5

Fix major performance issue with add_record O(N^2)

Azure DNS Support PR

fix unsafe plan text interpolation

Remove ; escapes before sending to ns1 and when pulling from

Add lenient to abstract BaseSource signature

Fix stacktraces on MainThreadExecutor

Before, 1-2k record took ~10s and more than that was just painful, 5k took
forever. This records things to keep a dict of nodes with a set of records so
that we can quickly "jump" to the point we're looking for without having to
search. 10k records now takes ~5s.

Ns1 rate limit handling

Supply 'Marker' to Route53 client when paging in order to correctly r…

CHANGELOG, version bump, pass at release script

Manually join self.values to avoid double escapes, e.g. \\;