Add items in User Defaults editor

[achernenko-schibsted]

Is your feature request related to a problem? Please describe. User Defaults editor doesn't seem to support adding items which makes certain kind of changes impossible. While less useful at the top level (typing keys by hand is cumbersome), adding items seems like an essential editing feature for dictionaries/arrays.

Describe the solution you'd like Something similar to the way PLIST editor in Xcode (plus/minus buttons for each item).

Describe alternatives you've considered If there already is a way to do this, I wasn't able to find it.

[AvdLee]

Makes total sense, thanks for request this feature! I'll see what I can do 💪