fmt
refactor(core/commands2/add) split loop

@mappum
add online method to node
check mode with use func node.OnlineMode() bool
rename -> OnlineMode()

because this method doesn't check actual network status
refac(commands2/ls) split loop

@mappum
refac(commands2/pin) loop
extract toStrings method
add slice utils

ToStrings and ToReaders
extract unpin

@mappum