Core/Db/Conditions: Add ContidionTarget column which allows selection of objects which will be checked by condition, depending on SourceTypeOrReferenceId.

So far usable only with CONDITION_SOURCE_TYPE_SPELL:
ContidionTarget = 0 - check caster
ContidionTarget = 1 - check explicit target

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

@@ -856,8 +856,6 @@ Player::Player(WorldSession* session): Unit(true), m_achievementMgr(this), m_rep
     for (uint8 i = 0; i < MAX_POWERS; ++i)
         m_powerFraction[i] = 0;
 
-    m_ConditionErrorMsgId = 0;
-
     isDebugAreaTriggers = false;
 
     SetPendingBind(0, 0);