Fastremap

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* release(1.9.1): ipt handles 64-bit addressable arrays
* fix: support 64-bit addressable volumes for IPT

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* release(1.9.0): adds unique, minmax, refit, fit\_dtype, pixel\_pairs
* chore: add py3.8 to dockerfile
* feat: unique, minmax, refit, fit\_dtype, pixel\_pairs (20)

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* release(1.8.0): faster remap and mask operators
* perf: faster remap and mask operators (19)

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* feat: add support for single precision complex numbers to IPT (17)
* docs: move "all available functions" higher

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* release(1.6.2): mask\_except can accept maximum unsigned values
* fix: mask\_except can use maximum values for unsigned ints
* install: add -stdlib=libc++ for mac builds (14)

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* release(1.6.1): much faster renumber
* perf: much faster renumber (10)