Use clang-tidy

[Antoine Rondelet]

The code base has recently been formatted with clang-format using the same styling guide as the one in Zeth (see #48).

As a next step, it would be good to run clang-tidy on the code base to enforce best practices and catch potentially problematic code patterns. However, as opposed to clang-format which simply formats code, clang-tidy suggests code changes. As such, extra care needs to be allocated when using clang tidy. Rather than using the same config as in Zeth and run clang-tidy --fix (which could trigger an enormous amount of changes in the code, making the associated PR very painful to review.. effectively increasing risks of unexpected code behavior/bug), it is preferable to take an incremental approach and support a subset of checks from the Zeth clang-tidy config that doesn't shuffle the code too much.