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 defined(HAVE_CONFIG_H)
#include <config/bitcoin-config.h>
#endif
#include <chainparams.h>
#include <clientversion.h>
#include <compat.h>
#include <init.h>
#include <interfaces/chain.h>
#include <node/context.h>
#include <noui.h>
#include <shutdown.h>
#include <ui_interface.h>
#include <util/strencodings.h>
#include <util/system.h>
#include <util/threadnames.h>
#include <util/translation.h>
#include <functional>
const std::function<std::string(const char*)> G_TRANSLATION_FUN = nullptr;
static void WaitForShutdown(NodeContext& node)