[QTOOL-2974] Generate a full width reduced height bayer input
[QTOOL-2974] Generate a full width reduced height bayer input

- generate a full width reduced height bayer input to
  allow for:
  - integer number of vector widths in either 64 byte or
    128 byte mode
  - signifcant enough amount of work to make vector startup
    overhead negligable, but still run in a few minutes

- selected:
   input: ../images/bayer_raw_2592_200.pgm
       2592 200

  - full width of 2592 results in a 2560 wide output
    (2592 - 32) which is divisible evenly by 32, 64 & 128

       2560 / 32  = 80
       2560 / 64  = 40
       2560 / 128 = 20

  - 200 rows of the input to allow for generating 128 rows
    of output (after borders subtracted & rounded to 32, 64,
    or 128 tile sizes)

  - ~0.52MP input = ~1MB of 16-bit input image data

- added make target out_2592_200.ppm and ref_2592_200/*.ppm

- output image comparison , elapsed simulation time:
  ~4.9MP   out_raw.ppm      ~1hr  --timing -DNOFCAM
  ~0.33MP  out_2592_200.ppm ~5min --timing -DNOFCAM
  ~0.065MP out_small.ppm    ~2min --timing -DNOFCAM


Former-commit-id: 201146c4f5f8c51929a50074a88bf75337cf1f4e
Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide