v0.18.0 - Some more validation

[0.18.0] - 2023-04-13

Fixed

• When super().__init__() is called before all parameters of the child class are initialized, we don't get an error
  anymore.
  Now all classes remember their parameters when they are defined and don't try to access parameters that are not
  defined in their own init.
  (#69)

Changed

• Validation is now performed recursively on all subclasses. Note like before validation is still only performed once
  per class.
  But with this change, we can also validate base classes that are not used directly.
  (#70)

Added

• We validate now, if a child class implements all the parameters of its parent class.
  While not strictly necessary, this is a sign of bad design, if not done.
  It could also lead to issues with tpcps validation logic.
  (#70)
• It is now possible to hook into the validation and perform custom validation of classes.
  (#70)
• The dataset class now activly triggers validation and checks if the dataset subclass implements groupby_cols and
  subset_index.