Merge PR https://github.com/TrinityCore/TrinityCore/pull/13702 into 3.3.5

Core/RBAC: Add two side trade to RBAC

sql/updates/auth/2014_12_21_00_auth.sql

@@ -0,0 +1,9 @@
+-- Add rbac_permissions
+DELETE FROM `rbac_permissions` WHERE `id` = 51;
+INSERT INTO `rbac_permissions` (`id`,`name`) VALUES
+(51, 'Allow trading between factions');
+
+-- Add rbac_linked_permissions
+DELETE FROM `rbac_linked_permissions` WHERE `linkedId` = 51;
+INSERT INTO `rbac_linked_permissions` (`id`,`linkedId`) VALUES
+(194, 51);