application config
How to config XTCASHnetwork?
Run XTCASHnetwork with arg --help will print all options.
XTCASHnetwork can start with these options by command line args, or use -c followed a json file for configuration.
The option in config file will unwrap the front --, for example:
// the config file
{
    "db-max-open-files": 125,
    "db-read-buffer-size": 128,
    "db-threads": 4,
    "db-write-buffer-size": 256
}
If you want to check the default options, use --dump-config.
