[7254] Cleanups and batter checking in homebind/bgEntryPoint code.

* Load homebind data early in Player::LoadFromDB and use instead initital race points
      in cases need some safe point if current coordinate broken by some reason.
    * Store BG entry point in to WorldLocation and simplify calls.
    * Set bg entry point at GM teleports to battleground for correct
      auto-recall position at battleground end.

Author: VladimirMangos

--HG--
branch : trunk

src/game/MapManager.h

@@ -96,6 +96,11 @@ class TRINITY_DLL_DECL MapManager : public Trinity::Singleton<MapManager, Trinit
             return IsValidMAP(mapid) && Trinity::IsValidMapCoord(x,y,z,o);
         }
 
+        static bool IsValidMapCoord(WorldLocation const& loc)
+        {
+            return IsValidMapCoord(loc.mapid,loc.x,loc.y,loc.z,loc.o);
+        }
+
         void DoDelayedMovesAndRemoves();
 
         void LoadTransports();