Autofill spawned-by and spawns

[lawndoc]

Moving the following suggestion from #6 to a separate issue:

May I also suggest having the Spawned-by be autofilled whenever an exe is added that uses it?

I like the idea of auto-filling it, but the tricky part would be maintaining that as the number of docs grows. Maybe we could create a custom script to run via GitHub actions that scans any new/updated docs and autofills related documents. I'll ponder that one, but I think it's possible. Any comments or other ideas are welcomed :)

I'll assign this one to me for now.

[lawndoc]

I think to keep things accurate we would have to do 2 things with a script on new/updated binary docs:

1. Update existing docs affected by the new/updated doc
2. Scan for the binary in existing docs and update new docs with things that were missed

Part 2 could optionally be replaced with a separate script to generate a new doc with some fields auto-filled from existing docs. Then part 1 would be the only thing the CI script has to do.