`TFPSimpleThreadPool`
	ro	MinThreads
	ro	MaxThreads
	ro	AddTimeout
	ro	QueueTasks
	ro	BusyThreadCount
	ro	IdleThreadCount
	ro	ThreadCount
	ro	AutoCheckQueuedInterval

`TFPCustomSimpleThreadPool`
pt		MinThreads
pt		MaxThreads
pt		AddTimeout
pt		QueueTasks
pt	ro	BusyThreadCount
pt	ro	IdleThreadCount
pt	ro	ThreadCount
pt		AutoCheckQueuedInterval
		DefaultInstanceClass
	ro	Instance