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);

sql/updates/world/master/2020_07_16_05_world_2017_06_12_02_world.sql

@@ -0,0 +1,17 @@
+--
+DELETE FROM `trinity_string` WHERE `entry` BETWEEN 288 AND 295;
+INSERT INTO `trinity_string` (`entry`,`content_default`) VALUES
+  (288, '%s either isn\'t dead or has no loot available.'),
+  (289, 'LOOT INFO: %s (%d)'),
+  (290, '├ %s (%d items):'),
+  (291, '├─ %dx |c%08x|Hitem:%d:0:0:0:0:0:0:0:0|h[%s]|h|r (#%05d)'),
+  (292, '├ Money: %01d|TInterface\\MoneyFrame\\UI-GoldIcon:0:0:2:0|t %02d|TInterface\\MoneyFrame\\UI-SilverIcon:0:0:2:0|t %02d|TInterface\\MoneyFrame\\UI-CopperIcon:0:0:2:0|t'),
+  (293, '├ %s:'),
+  (294, '├─ %s (%d items):'),
+  (295, '├── %dx |c%08x|Hitem:%d:0:0:0:0:0:0:0:0|h[%s]|h|r (#%05d)');
+
+DELETE FROM `command` WHERE `name`='npc showloot';
+INSERT INTO `command` (`name`,`permission`,`help`) VALUES
+('npc showloot', 865, "Syntax: .npc showloot [all]
+
+Shows the loot contained in targeted dead creature.");