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 <chainparamsbase.h>
#include <clientversion.h>
#include <rpc/client.h>
#include <rpc/protocol.h>
#include <rpc/request.h>
#include <util/strencodings.h>
#include <util/system.h>
#include <util/translation.h>
#include <functional>
#include <memory>
#include <stdio.h>
#include <tuple>
#include <event2/buffer.h>
#include <event2/keyvalq_struct.h>
#include <support/events.h>
#include <univalue.h>
#include <compat/stdin.h>
const std::function<std::string(const char*)> G_TRANSLATION_FUN = nullptr;
static const char DEFAULT_RPCCONNECT[] = "127.0.0.1";
static const int DEFAULT_HTTP_CLIENT_TIMEOUT=900;
static const bool DEFAULT_NAMED=false;
static const int CONTINUE_EXECUTION=-1;
static void SetupCliArgs()