initial no_std support#4

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enomado wants to merge 4 commits intomarcbone:mainfrom

Commits on May 2, 2021

initial no_std support
enomado
committed

Commits on Jun 19, 2021

fix fmt
Marco Boneberger
committed
use tests in no-std environment + fix formatting of examples
Marco Boneberger
committed

Commits on Jul 5, 2021

add documentation for new functions, rename feature from "no_std" to "std" and invert logic
Marco Boneberger
committed