Core/Config: Refactored ConfigMgr

* Loading initial configuration files is now separate from loading any additional custom configs

src/server/game/Guilds/Guild.cpp

@@ -2123,7 +2123,7 @@ bool Guild::Validate()
         _SetLeaderGUID(pLeader);
 
     // Check config if multiple guildmasters are allowed
-    if (!ConfigMgr::GetBoolDefault("Guild.AllowMultipleGuildMaster", 0))
+    if (!sConfigMgr->GetBoolDefault("Guild.AllowMultipleGuildMaster", 0))
         for (Members::iterator itr = m_members.begin(); itr != m_members.end(); ++itr)
             if (itr->second->GetRankId() == GR_GUILDMASTER && !itr->second->IsSamePlayer(m_leaderGuid))
                 itr->second->ChangeRank(GR_OFFICER);