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Update to current stable rust edition 2021 and remove unneeded features

Kirpal Grewal requested to merge KGrewal1/posix-regex:update-2021 into master

Lots of the nightly features previously needed are now in stable, so move on to current stable toolchain and also lint with current clippy (also allows use of more rust in builts such as is_ascii_uppercase() and aliasing those functions)

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