Modernize the codebase - #204

Merged

gracinet merged 10 commits into

dgrunwald:masterfrom

markbt:modernize

Feb 4, 2020

Commits on Jan 28, 2020

move doc comments for extract! invocations
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9a7fcf1
allow deprecated use of get module filename and provide access to filename object
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16043db

Commits on Jan 29, 2020

increase required version of Rust to 1.32
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a801f00
suppress deprecation warning for std::mem::uninitialized
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bf41900
use std::sync::Once::new()
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9d9a32b
python27-sys: edition 2018
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5d096c3
python3-sys: edition 2018
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458f555
cpython: edition 2018
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d1d93c2
use edition 2018 style macro export and import
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45fdacc
use paste to generate module init symbol names
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a9e7e49