1. renameCommand('foo') // Salted md5 hash for all commands -> md5('foo'.$command)
2. renameCommand(function($command){ return 'my'.$command; }); // Callable
3. renameCommand('get', 'foo') // Single command -> alias
4. renameCommand(['get' => 'foo', 'set' => 'bar']) // Full map of [command -> alias]