separate the user being edited from logged in user

[EvilProfesseur]

previously the frontend expected any user to be able to log in as either normal or godmode user. As these entities were separated frontend needs to keep track of the actual godmode user (SYSTEM) being logged in and any user they're currently editing.

this is likely easy to add just by modifying the currentUser selector and isGod selector logic.

[EvilProfesseur]

mostly done, though requires a permament godmode users in DB. requires testing to make sure it's fine