Fill-voids

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* build: update build system
* install: fix str conversion error
* ci: update to py312

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* test: switch to using crackle compression
* chore: update config
* install: switch to using pyx
* install: update numpy import
* build: update build process for py311

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* build: update GHA for new python versions
* chore: update tox.ini
* chore: update cpp code for py311

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* chore: skip pypy2.7
* fix: remove deprecation notice about np.bool
* chore: add github actions

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* chore: update build system
* chore: add 3.9 to tox
* chore: retranspile with cython for python3.9
* docs: fix spelling mistake
* chore: change dockerfile to reflect requirements\_test.txt -> requirements\_dev.txt
* docs: mention 2d version, remove implication of multi-label coming soon
* refactor: make cpp interface nicer
* chore: remove unused variables

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* fix: inconsistency with TypeError and DimensionError
* chore: add appveyor for windows binaries
* chore: adding tox, cleanup Dockerfile
* feat: adds support for 2d images
* fix: handle bool type properly on MacOS