impl rename_all for #[derive(Display)] (#216)

[ModProg]

Resolves #216

Checklist

• Documentation is updated (if required)
• Tests are added/updated (if required)
• CHANGELOG entry is added (if required)

[tyranron]

@ModProg instead of modifying the ContainerAttributes with an additional slot (which is useless for the Debug), I think it's better to leave it "as is", and:

1. Move RenameAllAttribute into display module.
2. Inside display module do:

   struct ContainerAttributes {
       rename_all: RenameAllAttribute,
       common: super::ContainerAttributes,
   }

   and parse it as Either<RenameAllAttribute, super::ContainerAttributes> to omit repeating parsing of the super::ContainerAttributes twice.

[ModProg]

I thought It'd make sense to allow to have rename_all and bounds in the same attribute. But that will only at most save one line anyway.