Feature/c tiffwriter (#249)

* Added C++ TIFF Writer
* Bump version to 0.7
* Rebuild setup toolchain to pyproject.toml
* Remove CLI utilities and tests
* Rename dlup.types to dlup._types
* Reduce cyclic imports
* Remove color transform from internal_handler='pil' (working towards v1.0)
* Bugfixes

Bump version to v0.6.1

Bump version to v0.6.0

Bump version to v0.5.3

Bump version to 0.5.2

Bump version to v0.5.1

Add color and z-index to annotations, support multiclass output (#228)

- Colors can now be added to annotations
- Z-indices can now be added to annotations to allow their sorting
- Sorting is now verified to work with ASAP, GeoJSON and Darwin V7
- Fixed a bug in polygons with multiple holes (see #224)
- Small changes in QuPath required to change the GeoJSON reading.
- `convert_annotations` now supports multiclass output
- A new annotation type: `AnnotationType.TAG`
- Ability to read Darwin V7 tags
- A bugfix for Darwin bounding boxes
- Automatic casting to AnnotationType.BOX for rectangular polygons
- Removal of function `rescale_geometry`

Improve docstring

Bump version to 0.4.0

Remove superfluous file