Merge topic 'clang-tidy-fixes'

ebb48d58 clang-tidy: address google-readability-casting lint
13b45a41 clang-tidy: address readability-else-after-return lints
87b57076 clang-tidy: address readability-braces-around-statements lints
ccab3808 clang-tidy: address readability-isolate-declaration lints

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !177