Add automatic code formatting and checking

[pbalcer]

Now that we are about to have a much bigger codebase with the introduction of the loader, it's about time to add convenience utilities to the build system to automate tedious or repetitive tasks. One of which is enforcing a consistent coding style across the entire repository.

This task is to propose and integrate a code formatting tool with the selected coding style.
My proposal is clang-format with the LLVM style, augmented with whatever changes the team decides on.

Because many files in this repo are automatically generated, the template files will probably need to be manually modified to conform to the tool-enforced style.

[kbenzie]

I'm fully on board with using clang-format. I think for enforcing single line if statements to have {} we might need clang-tidy though.

Because many files in this repo are automatically generated, the template files will probably need to be manually modified to conform to the tool-enforced style.

Could we automatically run clang-format as part of the source generation instead?

Would avoid making lots of annoying tweaks to the templates.

My proposal is clang-format with the LLVM style, augmented with whatever changes the team decides on.

Works for me, as long as we have a .clang-format file as that's what my editor looks for.