Populate MaxClients before OnPluginStart is called.

core/PlayerManager.h

@@ -233,6 +233,8 @@ private:
 	void OnServerActivate(edict_t *pEdictList, int edictCount, int clientMax);
 #endif
 	void InvalidatePlayer(CPlayer *pPlayer);
+private:
+	void InitializePlayers();
 private:
 	List<IClientListener *> m_hooks;
 	IForward *m_clconnect;