There are two answers to this, depending on what, exactly, you're asking.
1. The old Cheats (and Codex Console) have been replaced by the
Cheat Menu. Most, but not all, of the old Cheats have been implemented.
2. You can open the Developer/Browser Console with F12 or Control + Shift + I.
You can type in code to execute, reducing the need for an external Save Editor, if you know the correct commands. There's a thread
here with some specific things you can do.