[7607] Improvements in support some generic achievement classes Author: VladimirMangos

* Implement support achievements with refAchievement field != 0, that have criterias stored in achievement refAchievement.
    * Implement support achievement complete req. with specific count of completed critirias.
    * Avoid full achievement list scan at search achievement associated with criteria.

--HG--
branch : trunk

src/game/DBCStructure.h

@@ -55,8 +55,8 @@ struct AchievementEntry
     //uint32    icon;                                       // 42 icon (from SpellIcon.dbc)
     //char *titleReward[16];                                // 43-58
     //uint32 titleReward_flags;                             // 59
-    //uint32 count;                                         // 60 - need this count Criteria for complete
-    uint32 refAchievement;                                  // 61 - related achievement?
+    uint32 count;                                           // 60 - need this count of completed criterias (own or referenced achievement criterias)
+    uint32 refAchievement;                                  // 61 - referenced achievement (counting of all completed criterias)
 };
 
 struct AchievementCategoryEntry