GitLab

* Add support for PCAM dataset

* mypy

* Apply suggestions from code review
Co-authored-by: Philip Meier <github.pmeier@posteo.de>

* Remove classes and class_to_idx attributes

* Use _decompress
Co-authored-by: Philip Meier <github.pmeier@posteo.de>

* add prototype dataset for oxford-iiit-pet

* add old-style dataset

* add tests

* fix mypy

* fix test

* remove properties and use pathlib

* target_type to target_types

* move target annotation

* add docstring

* fix test