Merge topic 'more-clang-tidy'

de210648 clang-tidy: address `readability-else-after-return` lint
535633fa clang-tidy: address `readability-isolate-declaration` lint
83b20b65 clang-tidy: address `readability-braces-around-statements` lint

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !180