* clippy: remove unnecessary return statement
* Add hash, height, and confirmations fields to getblock RPC
* Remove a test that is already checked by snapshots
* Document the performance requirements of the getblock RPC
* Update snapshots, use new naming scheme
* Fix off-by-one error in confirmations
* Fix spelling mistakes
* Isolate RPC queries from the rest of Zebra, to improve performance
* Wrap RPC executor startup and shutdown in a std::thread
* Add tests for spawning RPC servers
* Adjust test timing and checks to reliably work cross-platform