* Adds documention to the Zebra book about custom Testnets, allows for configuring custom Testnet genesis hashes, refactors check for compatible custom Testnets, adds a TODO, and uses the default testnet when there's an empty or default `testnet_parameters` field in Zebra's network config.
* Adds example configs to custom Testnet docs, moves note about inbound connections on Regtest to a footnote.
* Adds a changelog entry
* Apply suggestions from code review
Co-authored-by: Marek <mail@marek.onl>
* Addresses suggestions from code review.
* Apply suggestions from code review
Co-authored-by: Arya <aryasolhi@gmail.com>
* Update book/src/user/custom-testnets.md
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Co-authored-by: Marek <mail@marek.onl>