It would be nice if the debug console had a little help page of itself, to describe the syntax to issue commands (also the nested ones), and a disclaimer that usage can be dangerous.

Maybe add a debug-console-only command like help that shows how to use nested commands and potentially other advanced tricks, and add 'for more information on using this console type XXX'.

See also:
- https://github.com/bitcoin/bitcoin/pull/7783#issuecomment-248274853
- https://github.com/bitcoin/bitcoin/issues/8544#issuecomment-240970925
- #8912 Console command paths cannot be specified correctly with backslashes
{
    switch(category)
    {
    case RPCConsole::CMD_REQUEST:  return "cmd-request"; break;
    case RPCConsole::CMD_REPLY:    return "cmd-reply"; break;
    case RPCConsole::CMD_ERROR:    return "cmd-error"; break;
    default:                       return "misc";
    }
}
void RPCConsole::fontBigger()