Remove I411 support, update doc and switch to side by side test

docs/formats.md

 # Introduction
 
 Formats (FOURCC) supported by libyuv are detailed here.
 
 # Core Formats
 
 There are 2 core formats supported by libyuv - I420 and ARGB.  All YUV formats can be converted to/from I420.  All RGB formats can be converted to/from ARGB.
 
 Filtering functions such as scaling and planar functions work on I420 and/or ARGB.
 
@@ skipping 19 matching lines @@
       kCMPixelFormat_444YpCbCr10     = 'v410',  Not supported.
       kCMPixelFormat_8IndexedGray_WhiteIsZero = 0x00000028,  Not supported.
     };
 
 
 # FOURCC (Four Charactacter Code) List
 
 The following is extracted from video_common.h as a complete list of formats supported by libyuv.
 
     enum FourCC {
-      // 9 Primary YUV formats: 5 planar, 2 biplanar, 2 packed.
+      // 8 Primary YUV formats: 5 planar, 2 biplanar, 2 packed.
       FOURCC_I420 = FOURCC('I', '4', '2', '0'),
       FOURCC_I422 = FOURCC('I', '4', '2', '2'),
       FOURCC_I444 = FOURCC('I', '4', '4', '4'),
-      FOURCC_I411 = FOURCC('I', '4', '1', '1'),
       FOURCC_I400 = FOURCC('I', '4', '0', '0'),
       FOURCC_NV21 = FOURCC('N', 'V', '2', '1'),
       FOURCC_NV12 = FOURCC('N', 'V', '1', '2'),
       FOURCC_YUY2 = FOURCC('Y', 'U', 'Y', '2'),
       FOURCC_UYVY = FOURCC('U', 'Y', 'V', 'Y'),
 
-      // 2 Secondary YUV formats: row biplanar.
+      // 1 Secondary YUV formats: row biplanar.
       FOURCC_M420 = FOURCC('M', '4', '2', '0'),
-      FOURCC_Q420 = FOURCC('Q', '4', '2', '0'),
 
       // 9 Primary RGB formats: 4 32 bpp, 2 24 bpp, 3 16 bpp.
       FOURCC_ARGB = FOURCC('A', 'R', 'G', 'B'),
       FOURCC_BGRA = FOURCC('B', 'G', 'R', 'A'),
       FOURCC_ABGR = FOURCC('A', 'B', 'G', 'R'),
       FOURCC_24BG = FOURCC('2', '4', 'B', 'G'),
       FOURCC_RAW  = FOURCC('r', 'a', 'w', ' '),
       FOURCC_RGBA = FOURCC('R', 'G', 'B', 'A'),
       FOURCC_RGBP = FOURCC('R', 'G', 'B', 'P'),  // rgb565 LE.
       FOURCC_RGBO = FOURCC('R', 'G', 'B', 'O'),  // argb1555 LE.
@@ skipping 33 matching lines @@
       FOURCC_CM24 = FOURCC(0, 0, 0, 24),  // Alias for RAW kCMPixelFormat_24RGB
       FOURCC_L555 = FOURCC('L', '5', '5', '5'),  // Alias for RGBO.
       FOURCC_L565 = FOURCC('L', '5', '6', '5'),  // Alias for RGBP.
       FOURCC_5551 = FOURCC('5', '5', '5', '1'),  // Alias for RGBO.
 
       // 1 Auxiliary compressed YUV format set aside for capturer.
       FOURCC_H264 = FOURCC('H', '2', '6', '4'),
 
 # Planar YUV
       The following formats contains a full size Y plane followed by 1 or 2
-        planes for UV: I420, I422, I444, I411, I400, NV21, NV12, I400
+        planes for UV: I420, I422, I444, I400, NV21, NV12, I400
       The size (subsampling) of the UV varies.
         I420, NV12 and NV21 are half width, half height
         I422, NV16 and NV61 are half width, full height
         I444, NV24 and NV42 are full width, full height
         I400 and J400 have no chroma channel.
 
 # The ARGB FOURCC
 
 There are 4 ARGB layouts - ARGB, BGRA, ABGR and RGBA.  ARGB is most common by far, used for screen formats, and windows webcam drivers.
 
@@ skipping 15 matching lines @@
 
 All formats can be converted to/from ARGB.
 
 Most 'planar_functions' work on ARGB (e.g. ARGBBlend).
 
 Some are channel order agnostic (e.g. ARGBScale).
 
 Some functions are symmetric (e.g. ARGBToBGRA is the same as BGRAToARGB, so its a macro).
 
 ARGBBlend expects preattenuated ARGB. The R,G,B are premultiplied by alpha.  Other functions don't care.