(maint) .gitignore add .idea
(#17031) Add octet_string_to_sid

 - This will allow a WIN32OLE instance returned by the connect method
    to convert its objectSID property (an octet stream / array of bytes)
    to a standard user friendly SID
(#17031) Add name_to_sid_object helper

 - Simple wrapper around creating new SID instances
 - Used to insulate tests from Win32::Security
(#17031) Parse user names with domain / account

 - User names were previously naively accepted without checking if
   they were qualified with a host or domain