They were added in the expansion pack that was free to download with the patches. I know the control-U works but I haven't used the others. I copied and pasted this below to MS Word so the spell checker corrected a couple of words otherwise it is as per Citizen Elden. You need to enable the cheat codes on the left side of menu screen (where you load and save games).

I did a search on 'cheat' and here is what I found.