Dijkstra3d

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* release(1.6.0): faster 6 and 18-way dijkstra
* fix: CC -> CXX
* chore: add py39 to build
* perf: improve speed for dijkstra 6-way and 18-way
* chore(build): add infrastructure for building manylinux2010 & 2014

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* release(1.5.1): fix broken py38 release for MacOS
* chore: update changelog

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* release(1.5.0): adds free\_space\_radius to EDF
* release(1.5.0): adds free\_space\_radius to EDF
* chore: more requirements\_dev.txt changes
* chore: create requirements\_dev.txt
* chore: add tox.ini for mac builds
* chore: add appveyor.yml for windows builds
* chore: update to production/stable and update python versions to tested ones
* test: add 3.8 to travis
* perf: euclidean distance field acceleration (11)

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* release(1.4.2): fix 64-bit addressable in euclidean distance field
* fix: ensure index is large enough for large images

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* release(1.4.1): update libdivide to support clang compilation
* chore: update libdivide.h
* chore: update Changelog

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* release(1.4.0): support 64-bit addressable arrays
* feat: support arrays with 64-bit indices (10)
* docs: link connectivity numbers to their respective distance metrics
* docs: eliminate duplicate text, specify finite weights