Scripts/Commands: new command '.debug instancespawn'

Port From (https://github.com/TrinityCore/TrinityCore/commit/386ec582334818bb46582290e9daecb19f453897)

sql/updates/auth/master/2018_01_24_00_auth.sql

@@ -0,0 +1,8 @@
+-- 
+DELETE FROM `rbac_permissions` WHERE `id`=871;
+INSERT INTO `rbac_permissions` (`id`,`name`) VALUES
+(871, 'Command: debug instancespawn');
+
+DELETE FROM `rbac_linked_permissions` WHERE `linkedId`=871;
+INSERT INTO `rbac_linked_permissions` (`id`,`linkedId`) VALUES
+(196,871);