Move large functions to .cpp files

[scarf005]

Summary

SUMMARY: Build "Move large functions to .cpp files"

Purpose of change

reduce large header sizes.

Describe the solution

manually moved implementation to cpp files using C-mantic vscode extension.

Describe alternatives you've considered

keep them as-is, to be honest i'm not sure if build time is reduced at all.

Testing

tested using cmake + ninja, compiled without error.

[olanti-p]

If my estimations are correct, this reduced total amount of compiled code by 50k LoC (approx. 0.9%).
Still, I think this is good from the de-bloating point of view.

[scarf005]

that's nice. may i ask which method did you use to calculate the result? maybe i should find and move more function body.

[olanti-p]

It's from a script I wrote back when I was optimizing headers in BN
https://github.com/olanti-p/simple_include_counter
It gives an estimate of how many source lines of code (excluding system and std includes) the compiler has to churn through.