[10529] Water level in movement use fixes.

* Move selection allowed upper and lower heights for target point
  into near point core function used for contact/close point selection.
  Selection base at possibility target point searcher fly/swim(or walk by water bottom).
* Use vamp water level data so have proper water level in instances in movements.
* Use increased ground search distance for water level case.

src/game/Level1.cpp

@@ -2027,7 +2027,7 @@ bool ChatHandler::HandleGoHelper( Player* player, uint32 mapid, float x, float y
         }
 
         Map const *map = sMapMgr.CreateBaseMap(mapid);
-        z = std::max(map->GetHeight(x, y, MAX_HEIGHT), map->GetWaterLevel(x, y));
+        z = map->GetWaterOrGroundLevel(x, y, MAX_HEIGHT);
     }
 
     // stop flight if need