use composer loader instead of get_declared_classes()
add `exit` after run command
remove test for command because now it is based on composer
use Config in Entity
add quote when generate sql
use static $class in command intead fetching from autoload
revert command.phpt
add quote on those column when generating sql
use $dir instead of $_rootDir in Config
use static $dir as main dir
remove command related methods in Entity
and change relevant tests