New-FlawlessRandomString - complexity requirements

[RamblingPSTech]

This will not guaranty the resultant random string will contain at least three of the four character groups necessary to satisfy Active Directory password complexity (capital letter, number, small letter, symbols, and does not contain name) as it makes a collection of all eligible character groups and randomly pick one character from the entire collection to add to the secure string. Technically the output could be 'eeeeeeeeee'.

Refs:
https://docs.microsoft.com/en-us/azure/active-directory/active-directory-passwords-policy
https://technet.microsoft.com/en-us/library/ff741764.aspx