Fuyu - Dev commands

[SlejmUr]

Probably need an assembly where we make dev releated commands.
Examples:

register username passw
unregister username
wipe accountid
list [accounts, etc]
reload config // no idea about that tbh.
restart
stop // we already handle with quit/exit i think

[seionmoya]

In devtools folder, we can make a backend mod called Fuyu.Devtool.BackendCommands and handle it in there.
Stop is implemented as exit command.