Phys/LoKiCore: Run clang-tidy

Gerhard Ravenrequested to merge
clang-tidy-4 into master

Run clang-tidy -checks=modernize-*,cppcoreguidelines-*,clang-analyzer-*,bugprone-*

The only manual tweaks were to 'undo' the amalgamation of nested namespace names back to separate namespace statements as in the original code

Edited by Rosen Matev

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