Update grid system. Try to fix some crashes and transport passengers (now they are despawned after a while).

src/server/game/Entities/Player/Player.cpp

@@ -629,7 +629,7 @@ UpdateMask Player::updateVisualBits;
 #ifdef _MSC_VER
 #pragma warning(disable:4355)
 #endif
-Player::Player (WorldSession* session): Unit(), m_achievementMgr(this), m_reputationMgr(this)
+Player::Player(WorldSession* session): Unit(true), m_achievementMgr(this), m_reputationMgr(this)
 {
 #ifdef _MSC_VER
 #pragma warning(default:4355)
@@ -839,7 +839,6 @@ Player::Player (WorldSession* session): Unit(), m_achievementMgr(this), m_reputa
     m_grantableLevels = 0;
 
     m_ControlledByPlayer = true;
-    m_isWorldObject = true;
 
     sWorld->IncreasePlayerCount();