Unified message(), str.format() and f-string formatting

They now all support the same set of values: strings, integers, bools, options, dictionaries and lists thereof.

• Feature options (i.e. enabled, disabled, auto) were not previously supported by any of those functions.
• Lists and dictionaries were not previously supported by f-string.
• str.format() allowed any type and often resulted in printing the internal representation which is now deprecated.