`TFPDocMarkDownTextRenderer`
pt		StartText
pt		EndText
pt		PushStyle
pt		PopStyles
pt		PopStyle
pt		Append
pt		DoRender
		BeginBlock
		EndBlock
		renderAttrs

`TMarkDownTextRenderer`
pt		DoRender
		RegisterRenderer
		render
		BeginBlock
		EndBlock

`TMarkDownElementRenderer`
		create
		reset