[CE C] Add more static analysis etc: clang-tidy

[adriweb]

See:

• https://clang.llvm.org/extra/clang-tidy/ (and possibly https://clang.llvm.org/docs/ClangCheck.html)
• https://stackoverflow.com/questions/49748996/apply-clangs-fix-it-hints-automatically-from-command-line
• https://sarcasm.github.io/notes/dev/compilation-database.html#clang