Storage derive problems

[Daanvdplas]

See how the storage item has different traits derived compared to here. This is because of the error:

the trait `StorageLayout` is not implemented

Using the #[ink::storage_item] macro also doesn't work because then:

the trait `WrapperTypeEncode`, `StorableHint<()>` is not implemented

Preferably you have one struct carrying the main storage macro (#[ink::storage], and everything that are sub structs carry the storage_item macro, but this doesn't work. The docs also directs devs to use it like this (ref)

[cmichi]

@davidsemakula Could you check if this is still the case?