[Feature Request] Nested Reference Picker

[Kamatis]

Currently, when you put a ReferencePicker attribute inside another ReferencePicker member, the child just shows the label without the ReferencePicker. I suggest having the ReferencePicker go down for multiple child levels.

[arimger]

Hello, thank you for the issue.

This is currently on my TODO list because [SerializeReference]-based properties don't support ToolboxAttributes at all. It's related to the obsolete logic of retrieving FieldInfo of such field (targeted type is serialized, not stored in the field). Anyway, for sure I will change it.

[arimger]

Should be fixed in #48.

If you encounter any other problem/bug related to [SerializeReference] usage please create another issue.