Update CUtlMemoryPool*, CUtlSymbol*, CUtlTSHash, CThreadSpinRWLock, CThreadFastMutex (now replaced by CThreadSpinMutex) Implemented some missing ThreadInterlocked* functions
Add CConcreteEntityList, CEntityComponent, CScriptComponent, CGameEntitySystem, rewrite IHandleEntity to use CEntityHandle instead of CBaseHandle, update NUM_SERIAL_NUM_BITS, comment out old CBaseEntity, obsolete basehandle.h