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

if (scriptPubKey.IsPayToScriptHash()) {
                    const CScriptID& hash = CScriptID(boost::get<ScriptHash>(address));
                    CScript redeemScript;
                    if (provider->GetCScript(hash, redeemScript)) {
                        entry.pushKV("redeemScript", HexStr(redeemScript.begin(), redeemScript.end()));
                        
                        CTxDestination witness_destination;
                        if (redeemScript.IsPayToWitnessScriptHash()) {
                            bool extracted = ExtractDestination(redeemScript, witness_destination);
                            CHECK_NONFATAL(extracted);
                            
                            const WitnessV0ScriptHash& whash = boost::get<WitnessV0ScriptHash>(witness_destination);
                            CScriptID id;
                            CRIPEMD160().Write(whash.begin(), whash.size()).Finalize(id.begin());
                            CScript witnessScript;
                            if (provider->GetCScript(id, witnessScript)) {
                                entry.pushKV("witnessScript", HexStr(witnessScript.begin(), witnessScript.end()));
                            }
                        }
                    }
                } else if (scriptPubKey.IsPayToWitnessScriptHash()) {
                    const WitnessV0ScriptHash& whash = boost::get<WitnessV0ScriptHash>(address);
                    CScriptID id;
                    CRIPEMD160().Write(whash.begin(), whash.size()).Finalize(id.begin());
                    CScript witnessScript;
                    if (provider->GetCScript(id, witnessScript)) {
                        entry.pushKV("witnessScript", HexStr(witnessScript.begin(), witnessScript.end()));
                    }
                }
            }