It's time - revive and remake the December 2019 Snapshot SDDM Theme #55
Description
Describe the bug
Back in December 2019 Snapshot's development, Feren OS was originally going to have a new login screen in the form of a custom SDDM Theme, making the switch from LightDM Slick Greeter, but due to issues with Switch User in SDDM at the time, this was scrapped and never revisited since...
This time around, given the developments in SDDM as of late, it's time to finally finish what was started in 2019, and given QML skill advancements leading to the lock screen of current Feren OS, and #54, it is time to finally realise the original mockups made by Thibault back when Feren OS was beginning development, and the lock screen redesign soon established for Inspire 4.0, as the login screen experience in Feren OS starting with the 10th Anniversary Release.