Implement object types

[JoaaoVerona]

Object types are the first - and more important - step for finally implementing object-oriented features.
Script should be able to create new object types, instantiate object types, call definitions inside object types and change attributes of object types.
Not only that, but object types can overload operators, define constructors, define attributes and create definitions.
It is not important for now to have inheritance, nor overriding polymorphism. Overloading polymorphism is already handled by the current function-finding system.

Definition:

new keyword to create a constructor
object keyword to create a new object type
opr keyword to overload an operator

Example usage:

object SomeObjectName {
  int size
  array elements
  bool enabled
  AnotherType child

  new(array elements, bool enabled) {
    this.enabled = enabled
    someFunction(elements)
  }

  opr +(SomeObjectName other) {
    return size + other.size
  }

  opr &&(SomeObjectName other) {
    return enabled && other.enabled
  }

  def someFunction(array elements) {
    this.elements = elements
    this.size = size(elements)
  }
}