hostname_from_fqdn work with utf8 or idna, whichever it's passed

Use super() now that we require python3, less error prone

IDNA support for Record values holding fqdns

Update CONTRIBUTING branch name to main

Record values are first-class objects

Fix version type-os in CHANGELOG, 0.0.18 twice

Remove from __futures__ bits, all are now manditory

Global processors support

Everything works with IDNA encoded names internally

Processor impl that filters on name

Implement TtlRestrictionFilter w/tests

Update README.md

Adding links to the noteworthy NetBox-DNS plugin and its OctoDNS provider

The mythicbeasts module (at least) is relying on them

This reverts commit 5d2ef02390.