Add new command 'npc showloot'.

Port From (https://github.com/TrinityCore/TrinityCore/commit/64d8b183de9c56e1350b7323167b509fe2c43805)

sql/updates/auth/master/2017_06_12_02_auth.sql

@@ -0,0 +1,7 @@
+DELETE FROM `rbac_permissions` WHERE `id`=865;
+INSERT INTO `rbac_permissions` (`id`,`name`) VALUES
+(865, 'Command: npc showloot');
+
+DELETE FROM `rbac_linked_permissions` WHERE `linkedId`=865;
+INSERT INTO `rbac_linked_permissions` (`id`,`linkedId`) VALUES
+(197,865);