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C++'s `noexcept` can sometimes help or hurt performance

ver the course of working on PSRayTracing (PSRT), I've been trying to find all sorts of tricks and techniques to squeeze out more performance from this C++ project. Most of it tends to be alternative algorithms, code rewriting, and adjusting data structures.

Second, the Standard Library is noexcept-aware and uses it to decide between copies, which are generally slow, and moves, which can be orders of magnitude faster, when doing common operations like making a vector bigger. The people who like noexcept might find this validating, but it's at odds with the tables from measuring PSRT: The speedups here aren't being matched with all the results from book 1, which uses the same "sequential search in std::vector" technique. As for the benchmark itself, I would have loved to throw in some Android and iOS runs as well, but I do not have the bandwidth for that, or infrastructure to make it possible unless I were to quit my day job.

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