Add FreeBSD Style to the LLVM Clang-Format Style Options

[kfv]

It might require an update to the FreeBSD style(9), as there are probably a few things that we haven't dealt with well yet. We can then work on opening a PR for the LLVM project and writing a .clang-format for our projects. Hence:

• [ ] Check style(9) and see if it requires an update - in respect of the standard, specifically.
• [ ] Fork llvm/llvm-project and add our style to predefined styles.
• [ ] Add .clang-format to our projects and run some tests.
• [ ] Open a PR and submit our changes to the LLVM project.