(maint) Ensure FFI code is standardized

 - Puppet::Util::Windows::Adsi - move to bottom of self
 - Puppet::Util::Windows::File - move to bottom of module
 - cleaned up uses of non-symbolic ffi_lib calls
Merge remote-tracking branch 'ferventcoder/ticket/master/PUP-2382-Ensure-FFI-formatting'

* ferventcoder/ticket/master/PUP-2382-Ensure-FFI-formatting:
  (maint) Ensure FFI code is standardized