Dcnum

- fix: properly handle empty logs

- fix: make sure values in tables dictionary are one-dimensional

- meta: increment pipeline ID (texture feature computation)
- fix: HDF5Data was not pickable
- fix: HDF5Data did not properly handle tables
- enh: add context manager for CPUSegmenter
- enh: record and log execution time of segmentation and feature extraction
- enh: properly handle border case for computing contour-moments
- enh: properly handle empty images/masks in haralick texture features
- tests: do not use numba's JIT during testing (coverage)

- fix: fix GPUSegmenter labeling

- feat: introduce GPUSegmenter base class
- fix: handle bytes-values in HDF5 attributes
- ref: correctly introduce `requires_background_correction` for segmenters
- setup: don't requrie cibuildwheel

- enh: some minor improvements in efficiency
- ref: increment DCNUM_PPID_GENERATION for the sake of clarity
- ref: unify dealing with num_workers and debugging