Add build macro format tool

[kennykerr]

Adds a simple tool that can format build macros. I'll create a separate PR to update the build macros to use {} instead of () and perhaps we can use the yml trick from #828 to verify in CI builds. What do you think @MarijnS95?

[MarijnS95]

What do you think @MarijnS95?

Disappointed. I just started writing the same to update #828 - not sure why you're doing duplicate work, is there that much priority to get this in? I don't think I stated anywhere to need help or not have time to "rewrite" the script.

[kennykerr]

Sorry, I didn't realize you were working on that. I didn't know how else to describe what I was looking for. It took a few minutes so I thought I'd just take a stab at it. No hurry, so if you've got something in the works I'm happy to wait for that. Let me know.

[MarijnS95]

@kennykerr Sorry, no harm done - I might have overreacted a bit. The PR is now updated with the script in its entirety ported to Rust, dealing with the generate! macro as well. Let me know if, and if so how to split it up:

1. Use {} everywhere;
2. Add the script;
3. format all macros with it;
4. Enforce the script in the CI (yml ""trick"" 😀).