feat: Add 4 methods (#158)

1:
Player:GetAchievementPoints

2:
Player:GetCompletedQuestsCount
This should have been GetCompletedQuestsCount, not sure how to update that now.

3: You also have an option to include feats of strength or not (not included by default, blizzard like)
Player:GetCompletedAchievementsCount

4: RegisterPlayerEvent
OnCreatureKilledByPet

src/LuaEngine/PlayerMethods.h

@@ -903,6 +903,51 @@ namespace LuaPlayer
         Eluna::Push(L, player->GetPhaseMaskForSpawn());
         return 1;
     }
+
+    /**
+     * Returns the [Player]s current amount of Achievement Points
+     *
+     * @return uint32 achievementPoints
+     */
+    int GetAchievementPoints(lua_State* L, Player* player)
+    {
+        uint32 count = 0;
+        const CompletedAchievementMap& completedAchievements = player->GetAchievementMgr()->GetCompletedAchievements();
+        for (auto& pair : completedAchievements)
+        {
+            AchievementEntry const* achievement = sAchievementStore.LookupEntry(pair.first);
+            if (achievement)
+            {
+                count += achievement->points;
+            }
+        }
+
+        Eluna::Push(L, count);
+        return 1;
+    }
+
+    /**
+     * Returns the [Player]s current amount of Achievements Completed
+     *
+     * @return uint32 achievementsCount
+     */
+    int GetCompletedAchievementsCount(lua_State* L, Player* player)
+    {
+        uint32 count = 0;
+        bool countFeatsOfStrength = Eluna::CHECKVAL<bool>(L, 2, false);
+        const CompletedAchievementMap& completedAchievements = player->GetAchievementMgr()->GetCompletedAchievements();
+        for (auto& pair : completedAchievements)
+        {
+            AchievementEntry const* achievement = sAchievementStore.LookupEntry(pair.first);
+            if (achievement && (achievement->categoryId != 81 || countFeatsOfStrength))
+            {               
+                    count++;             
+            }
+        }
+
+        Eluna::Push(L, count);
+        return 1;
+    }
 #endif
 
 #if defined(TBC) || defined (WOTLK)
@@ -1731,6 +1776,19 @@ namespace LuaPlayer
         return 1;
     }
 
+    /**
+     * Returns the [Player]s completed quest count
+     *
+     * @return int32 questcount
+     */
+    int GetCompletedQuestsCount(lua_State* L, Player* player)
+    {
+        uint32 count = player->GetRewardedQuestCount();
+
+        Eluna::Push(L, count);
+        return 1;
+    }
+
     /**
      * Returns the [Player]s [Corpse] object
      *