Support for C in tools.cmake

[cconverse711]

All the tools in tools.cmake are currently applied to only C++ code, however they all support C code as well. Supporting C should just be a fairly straightforward -- for example setting the CMAKE_C_CLANG_TIDY to match CMAKE_CXX_CLANG_TIDY

[StableCoder]

I committed c1a621a, which I think covers it. let me know if there's still an issue.

[cconverse711]

Thank you, that looks good.

Though I am curious about the intended behavior of the cppcheck logic in tools.cmake. There's a if (CPPECHECK) check (note the typo) here that will evaluate to false due to the typo, however the logic inside that check's body is modifying the CMAKE_CXX_CPPCHECK variable with additional cppcheck flags. But when the cppcheck() macro is invoked, the CMAKE_CXX_CPPCHECK is overwritten and wipes out the cppcheck flags that were applied earlier. Are those flags supposed to persist, or is that an old approach for applying cppcheck flags that's no longer meant to be used?

[StableCoder]

Honestly, I'm not entirely sure anymore. Much of the implementation is several years old.

However, as you do note it was a bit confusing, so I've gone ahead and re-worked the implementation (ba83421), and hopefully made things much clearer.

I've gone fully down the road of giving better control of the tools to the calling scripts, and the ability to overwrite/clear flags at-will throughout.

Let me know if what it is now is still unclear, or what parts of it are, and I'll try to fix/make things even clearer.