First step to generating chainparams header files. Next step is to
generate the header file based on the output of running this script
once for each chain.
In the near future, this pipeline becomes possible (all TODO):
- A bot with up-to-date nodes runs this script.
- Chainparams header is generated.
- Smoke tests are run on the result and landed on master automatically.
For now, this script can be used manually.
Split off from D3502. This iteration achieves a simpler design by being split
into two steps.
Progress towards T663