major and minor extensions

general: as recommended in dsoares#50 this is now the new master as the old master https://github.com/dsoares/ went stale.

major extensions (see also pending/stale dsoares#51)

• add hCaptcha support
• add Friendly Captcha support
• add Cloudflare's Turnstyle (captcha) support

minor extensions (see also pending/stale dsoares#49)

• add support for IPv6 CIDR match