libevent seems to have invaded `libbitcoin_common` via `url.cpp`

`url.cpp` is used only from `test/fuzz/string.cpp` and `wallet/rpcwallet.cpp`

libevent should only be required for bitcoind, bitcoin-cli and (due only to the hack of passing wallet names) bitcoin-qt

{
    LogInstance().DisconnectTestLogger();
    fs::remove_all(m_path_root);
    ECC_Stop();
}
TestingSetup::TestingSetup(const std::string& chainName) : BasicTestingSetup(chainName)