(MODULES-4485) Improve ipv6 support for type

* Improves regex to catch some valid (but less 
known) ipv6 strings, mostly those which are a mix
of ipv6 strings and embedded ipv4 numbers
* Regex inspired by the following:
	* https://github.com/sindresorhus/ip-regex
	* https://gist.github.com/cpetschnig/294476
	* The original Dartware forum thread where 
someone originally created this beast of a regex,
now lost except to archive.org
* Whilst we're here, we can add the more tricky
ipv6 strings to the existing functions to validate
* Luckily, the `ipaddr` native ruby library used 
in the original functions already supports these

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