Czitools

- reading CZI as 6d array now uses dask delayed reading for individual 2d planes (inspired by [pr4deepr](https://github.com/pr4deepr)
- renaming functions
- updates demo scripts and notebooks
- bugfixes

- more tests
- different way to store objective metadata to account for more than one objectives
- removed cztile requirement

* refactoring
* additional and improved tests

- bugfixes
- updated Readme and examples
- use of Dataclass and python-box to create the metadata object

* bugfixes from reading CZIs without scene informations
* more tests

- bugfix for napari_tools.py
- - added more tests