(from discussion on IRC. Currently a global `settxfee` has to be changed to override the fee rate, it would make sense to be able to specify it on a per-transaction basis. This would continue #7518)

```
-*- jonasschnelli thinks we should probably add a optional feerate parameter to fundrawtransaction
<wumpus> jonasschnelli: there isn't one yet?
-*- jonasschnelli looking..
<wumpus> I'm surprised, would be so much better than changing a global
<jonasschnelli> no.. i don't think so. Maybe there is a PR.
<sipa> there is a pr
<jonasschnelli> Hard to keep track of everything. :)
<wumpus> no, the PR does it wrong
```

Regarding implementation:

```
<jonasschnelli> The ugly thing is, that CreateTransaction uses the static DEFAULT_TARGET
<wumpus> passing in an optional feerate would be the obvious thing to do
<jonasschnelli> So, this would require some refactoring.
<sipa> just add a confirmation target to coincontrol
<jonasschnelli> Yes. This sounds good.
<wumpus> right, just slap it into coincontrol
<sipa> wasn't there a PR that added a bunch of options to fundrawtransaction?
<sipa> including that
<jonasschnelli> Not the feerate.
<jonasschnelli> But the rest is merged.
```

{
    if (!EnsureWalletIsAvailable(fHelp))
        return NullUniValue;
    if (fHelp || params.size() > 4)
        throw runtime_error(
            "listtransactions ( \"account\" count from includeWatchonly)\n"
            "\nReturns up to 'count' most recent transactions skipping the first 'from' transactions for account 'account'.\n"
            "\nArguments:\n"
            "1. \"account\"    (string, optional) DEPRECATED. The account name. Should be \"*\".\n"
            "2. count          (numeric, optional, default=10) The number of transactions to return\n"
            "3. from           (numeric, optional, default=0) The number of transactions to skip\n"
            "4. includeWatchonly (bool, optional, default=false) Include transactions to watchonly addresses (see 'importaddress')\n"
            "\nResult:\n"
            "[\n"
            "  {\n"
            "    \"account\":\"accountname\",       (string) DEPRECATED. The account name associated with the transaction. \n"
            "                                                It will be \"\" for the default account.\n"
            "    \"address\":\"bitcoinaddress\",    (string) The bitcoin address of the transaction. Not present for \n"
            "                                                move transactions (category = move).\n"
            "    \"category\":\"send|receive|move\", (string) The transaction category. 'move' is a local (off blockchain)\n"
            "                                                transaction between accounts, and not associated with an address,\n"
            "                                                transaction id or block. 'send' and 'receive' transactions are \n"
            "                                                associated with an address, transaction id and block details\n"
            "    \"amount\": x.xxx,          (numeric) The amount in " + CURRENCY_UNIT + ". This is negative for the 'send' category, and for the\n"
            "                                         'move' category for moves outbound. It is positive for the 'receive' category,\n"