Fix array index bug#10

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DumpsterDoofus wants to merge 3 commits intoArgusMagnus:masterfrom

DumpsterDoofus:fix-array-index-bug

Commits on Jul 11, 2020

Update to NETStandard 2.1, add autogenerated partial class that I handwrote because the .tt file generator didn't work
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Use fix from https://github.com/ArgusMagnus/FFTW.NET/issues/6#issue-377010157
DumpsterDoofus
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Update package version
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