This commit is specifically to be ready for the 8.5 release. As such,
these are the changes made:

* The default preset has renames and a large amount of additions to
  be in line with RHEL upstream
* Spec file reflects 8.5 - This means there should be no more changes
  to the release package during 8.4
* In addition, the sddm display manager has been added to the display
  manager preset

As a reminder, this branch should no longer accept changes for 8.4 for
the month of October.