Merge branch 'issue/fold_expressions' into 'develop'

changed compiler feature detection name for fold expressions

See merge request !82
Status Job ID Name Coverage
  Test
canceled #8424
debian:10 clang-6-libcpp-17

canceled #8423
debian:10 gcc-8-17

canceled #8425
debian:9 gcc-6-14

canceled #8426
ubuntu:18.04 clang-6-17