Backport 2.16: range-based constant-flow base64#4819

Merged

mpg merged 15 commits intoMbed-TLS:mbedtls-2.16from gilles-peskine-arm:base64-no-table-2.16

Oct 27, 2021

+523-166

Commits on Jul 26, 2021

New sample program to benchmark certificate loading
gilles-peskine-arm
committed

Commits on Aug 3, 2021

Fix printf format signedness error
gilles-peskine-arm
committed

Commits on Aug 6, 2021

Fix the build of sample programs without mbedtls_strerror
gilles-peskine-arm
committed

Commits on Oct 25, 2021