Better string representation of variables

[miso-belica]

• Collapsable lists, tuples, distionaries, ...

{
 "list": [1,2,3],
 "tuple": (4,5,6),
 "number": 23,
}

• Collabsable instances of user types

MyBestClass {
 "property": "value",
 "_attribute": "secret",
 "__attribute": "private?"
}

• Truncate long string and append "..." (maybe)

string : str = "very long string..."