Core/Dungeon Finder: Code cleanup and minor optimizations

- Extend LfgState to keep control of the state of group and players using LFG
- Move scripts to its own class and initialize only if Dungeon finder is enabled
- Updated comments to doxygen format
- Use constructor initialization list
- All variables are declared in the inner most scope
- Fix some mem leaks
- Remove no longer needed code (Cleaner)
- Normalize handler function names

--HG--
branch : trunk

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

@@ -22190,13 +22190,13 @@ PartyResult Player::CanUninviteFromGroup() const
         if (grp->GetLfgKicks() == GROUP_MAX_LFG_KICKS)
             return ERR_PARTY_LFG_BOOT_LIMIT;
 
-        if (grp->isLfgKickActive())
+        if (GetLfgState() == LFG_STATE_BOOT)
             return ERR_PARTY_LFG_BOOT_IN_PROGRESS;
 
         if (grp->GetMembersCount() <= GROUP_LFG_KICK_VOTES_NEEDED)
             return ERR_PARTY_LFG_BOOT_TOO_FEW_PLAYERS;
 
-        if (grp->isLfgDungeonComplete())
+        if (GetLfgState() == LFG_STATE_FINISHED_DUNGEON)
             return ERR_PARTY_LFG_BOOT_DUNGEON_COMPLETE;
 
         if (grp->isRollLootActive())

src/server/game/Entities/Player/Player.h

@@ -2260,10 +2260,27 @@ class Player : public Unit, public GridObject<Player>
         void SetLfgComment(std::string _comment) { m_LookingForGroup.comment = _comment; }
         uint8 GetLfgRoles() { return m_LookingForGroup.roles; }
         void SetLfgRoles(uint8 _roles) { m_LookingForGroup.roles = _roles; }
-        bool GetLfgUpdate() { return m_LookingForGroup.update; }
-        void SetLfgUpdate(bool update) { m_LookingForGroup.update = update; }
-        LfgState GetLfgState() { return m_LookingForGroup.state; }
-        void SetLfgState(LfgState state) { m_LookingForGroup.state = state; }
+        LfgState GetLfgState() const { return m_LookingForGroup.state; }
+        void SetLfgState(LfgState state)
+        {
+            
+            switch(state)
+            {
+                case LFG_STATE_NONE:
+                case LFG_STATE_DUNGEON:
+                case LFG_STATE_FINISHED_DUNGEON:
+                    m_LookingForGroup.oldState = state;
+                    // No break on purpose
+                default:
+                    m_LookingForGroup.state = state;
+            }
+        }
+        void ClearLfgState()
+        {
+            m_LookingForGroup.applyDungeons.clear();
+            m_LookingForGroup.roles = ROLE_NONE;
+            m_LookingForGroup.state = m_LookingForGroup.oldState;
+        }
         bool isUsingLfg() { return GetLfgState() != LFG_STATE_NONE; }
 
         typedef std::set<uint32> DFQuestsDoneList;