* add pure state functionality for win_group_membership
* fixing typos in docs
* fix syntax for adding removed array depending on state
* remove trailing whitespace from docs
* fix issue in testing pure (again)
* adding note for pure being added in Ansible 2.8
* refactor win_group_membership to use SIDs for comparisons instead of name parsing
* carry over previous doc cleanup changes
* remove trailing whitespace from docs
* Admin account is not always called Administrator (eg Azure)
* this fixes some, but not all issues related to the Administrator account on non-English Windows as well (still numerous references to "Administrators" and other en-US Windows group names)
