`TCustomHTTP2Handler`
pt		SetActive
pt		GetActive
pt		Notification
pt		CheckInactive
pt		HandleError
pt		RunConnection
pt		ConnectionDone
pt		ThreadConnectionDone
pt		CloseConnections
pt		JoinThreads
pt		CloseTransport
pt		LingeringClose
pt		DoAdoptPriorKnowledge
pt		DoAdoptHTTP2
pt		DoAdoptALPN
pt		DoCheckH2CUpgrade
pt		DoUpgradeH2C
		Create
		Destroy
		AdoptConnection
		WaitForConnections
		ConnectionCount