Format script

[noiuynoise]

I had a hard time reading the source code and clang-format made it much easier for me. Here is a PR for a simple script to auto format the project source/header files.

I know that the specific formatting is sometimes controversial. Let me know if there are any things that should be changed. If this goes in I'll make a second PR after running the script with just the format changes, this keeps the actual changes easier to see.