minetd invocation

Usage:
./minetd [-f file] [-c command] [-v]
-f files are read and config commands executed line by line; -c is interpreted as a single command. Multiple of -f and -c can be specified in any order; order does matter, as commands update global states sequentially.

If -v is specified, it increases verbosity level. -v can be specified multiple times.

After starting, minetd creates the services specified by the commands and stay in foreground printing monitoring messages to stdout.