reformat all c++ files with clang-format

[jkarneges]

We should autoformat the C++ code similar to how we use rustfmt for the Rust code. This PR uses clang-format to reformat all of the C++ code to a consistent, modern style. I did not attempt to preserve the existing style which was doing some things I think we should phase out, such as braces on new lines. This change only contains the reformatting and nothing else. Later, we can add a .clang-format file, update CI to enforce style, etc.

To review, I suggest performing the same mass reformatting locally and confirming the resulting diff is the same as this one. To do that:

• Install clang-format

• Add the following .clang-format file to the root of the project:

Language: Cpp
BasedOnStyle: LLVM

# Use 4 spaces to match rustfmt
IndentWidth: 4
ContinuationIndentWidth: 4
ConstructorInitializerIndentWidth: 4

# Keep braces on the same line (Rust/Modern C++ style)
BreakBeforeBraces: Attach

# Clean layout
ConstructorInitializerAllOnOneLineOrOnePerLine: true
AccessModifierOffset: -4
ColumnLimit: 100

• Run find src -name "*.cpp" -o -name "*.h" | xargs clang-format -i from the project root. As far as I can tell, clang-format can't crawl a project tree on its own so we have to use something like find to hit every file.

[deg4uss3r]

yeah... LGTM