WIP: Feature/#353 add clang tidy to the mix

Jan Delemberrequested to merge
feature/#353_Add_clang-tidy_to_the_mix into master

These are the changes introduced by using clang-tidy.

All in all, we have done a decent job. Congrats!

Please comment on anything that you find strange, worthy to discuss, …

Edited by Jan Delember

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