`TFPReaderGif`
pt		ReadPalette
pt		AnalyzeHeader
pt		InternalRead
pt		ReadScanLine
pt		WriteScanLine
pt		InternalCheck
pt		SkipBlock
pt		InternalSize
		Create
		Destroy

`TFPCustomImageReader`
pt		InternalRead
pt		InternalCheck
pt		InternalSize
		Create
		ImageRead
		CheckContents
		ImageSize

`TFPCustomImageHandler`
pt		Progress
		Create