* Remove CellLock class and all cell-level thread locking.

** It was wasting CPU power as cell-level locking is not needed.
** Our multithreading is on map-level, not cell-level.
** CellLock was just a 'proxy' between Cell and CellPair and in some cases carried redundant data.
** Some minor cleanup in Cell::Visit/Map::Visit.

--HG--
branch : trunk

src/game/ScriptedCreature.cpp

@@ -501,8 +501,7 @@ Player* ScriptedAI::GetPlayerAtMinimumRange(float fMinimumRange)
     Trinity::PlayerSearcher<Trinity::PlayerAtMinimumRangeAway> searcher(m_creature, pPlayer, check);
     TypeContainerVisitor<Trinity::PlayerSearcher<Trinity::PlayerAtMinimumRangeAway>, GridTypeMapContainer> visitor(searcher);
 
-    CellLock<GridReadGuard> cell_lock(cell, pair);
-    cell_lock->Visit(cell_lock, visitor, *(m_creature->GetMap()));
+    cell.Visit(pair, visitor, *(m_creature->GetMap()));
 
     return pPlayer;
 }