Connected-components-3d

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* release(1.6.0): lower memory usage for 16-bit output type
* perf: limit union-find allocation by maximum representation size (35)
* install: help old python versions compile cc3d on mac

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* docs: there are actually a few multiple dispatch versions
* fix: wrong dtype for fake assignment
* fix: errant compiler warning about uninitalized variables
* feat: support non-32-bit output types (33)
* chore: add py38 to Dockerfile + changelog update
* docs: show link to benchmarks in README

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* release(1.4.1): ensure documentation and version number are correct
* docs: update docstring for connected\_components
* docs: add example of connectivity argument for region\_graph

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* release(1.4.0): Support 26, 18, and 6 connectivities
* feat: add 6 and 18 connected functions (26)
* Update README.md
* feat: region graph function (20)
* Update README.md
* Update README.md
* docs: add table to benchmarks on head to head comparisons
* docs+fix: random benchmark was not using 26-connected on scipy
* Update README.md
* Update README.md
* docs: add benchmark for random binary images
* Update README.md
* docs: update changelog
* docs: change language around max\_labels usage
* docs: update instructions for extracting labels
* docs: update multilabel benchmark for 1.2.2
* chore: update perf.py with new way of finding max labels
* docs: update head to head benchmark

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* release(1.2.2): avoid copying output to numpy array
* perf: save time and memory by not copying to numpy array (19)

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* release(1.2.1): drop union by size for half memory and 10-20% more speed
* perf: remove union-by-size for lower memory and better performance (17)
* fix: merge error
* refactor: move includes inside ifndef
* docs: update description in hpp file
* chore: remove scikit-image dependency from manual testing