Wildcard support!

Changes in this version: 2020-10-02 Various fixes to get_auth_dns and changes to support unit tests (#308) 2020-10-04 Add CHECK_PUBLIC_DNS_SERVER to check the DNS challenge has been updated there 2020-10-13 Bugfix: strip comments in drill/dig output (mhameed) 2020-11-18 Wildcard support (#347)(#400)(2.31)

Plus several code hygiene changes from @PeterDaveHello to improve the code base And change to allow scoped Cloudflare API Tokens from @waddles