431: another image transformation

not complete
431.1: ImageGraphics2D
432:
434: refactor
435: temp remove some unused classes
436
437: refactor
438:  ImageBufferAccessor
440: ImgSpanGen ctor
441: ImgSpanGen , FilterImageSpanGenerator  ctor
442: ImageSpanGen.GenerateColors()
443: LineInterpolatorDDA2.Y
444: change not needed array to local var

reduce heap needed
445: BlendInFilterPixel
447: ImgSpanGen ctor
448: FilterImageSpanGenerator.ImageBufferAccessor
Merge branch 'v_img' into v_mini01