Move `__str__`, `__repr__` and `__bool__` from all objects to separate protocols

[plajjan]

Protocols names?

• Boolable / Bool
• Stringable / Str

Does __repr__ need its own protocol or does it go into Stringable?

[plajjan]

@sydow we discussed this yesterday and I got the feeling you were eager to pick this up sooner rather than later. Should we decide on the protocol names we want? :)

[sydow]

Absolutely. I have neither strong views nor clever ideas. I could think of Bool for the protocol which contains only bool and Str for the one with str and repr. The latter could also be Print or Printable, but that may give wrong associations. Other ideas?

Björn