Core/Map: New Map::ForceRespawn to override objections and force a respawn (equivalent to force = true). Use this to fix various GM commands.

Port From (https://github.com/TrinityCore/TrinityCore/commit/8b7728f82e6e7c326b7945efd719218179e9767a)

sql/updates/world/master/2021_05_16_09_world_2018_01_07_03_world.sql

@@ -0,0 +1,10 @@
+-- 
+DELETE FROM `linked_respawn` WHERE `guid`=137752 AND `linkedguid`=137752 AND `linkType`=0;
+UPDATE `trinity_string` SET `content_default`='NPC currently selected by player:
+Name: %s
+SpawnID: %s.
+GUID: %s.
+Entry: %u.
+Faction: %u.
+NPC Flags: %s.
+DisplayID: %u (Native: %u).' WHERE `entry`=539;