Easy switch of bitcoin network (regtest, etc.) #58
Description
The dev environment currently uses regtest, it was recently changed from testnet4 recently (pr #52).
It would be nice if the network could by changed easily (config in a single place), as different test networks have different benefits.
Also, later switching to mainnet should be done easily.
It would be nice if regtest, testnet4, signet and mainnet are supported.
The only issue is with bitcoind ports, which are hardcoded in some places.