5.x nesting depth

[dereuromark]

This has been annoying the heck out of me for the last months

All the time, the default level of 3 for the other tabs (not Variables, which is already 5) is usually never enough, especially for session

Auth.User.Profile.Image.id

etc

Fun fact: current level 3 doesnt even show content of Profile, so the count seems to be cut off already on level 2...

For now I always have to either

• hack the debug kit by putting a change into the Panel code inside vendor/, to increase to e.g. 5, bad idea
• workaround it using dd() or other debugging tools in the end

not being able to trust debug kit to give me the details after clicking through the tree of elements only to find [maximum depth reached]

So I recommend we default to 5 here in general, and allow the other tabs to be configured as well.
I on purpose used a different key, as VariablesPanel is sure different as it contains really a LOT of data, compared to the others, So keeping that one at 5 while allowing the others to be safely used on e.g. 8 makes sense to me.