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

include/libyuv/convert_from_argb.h

Index: include/libyuv/convert_from_argb.h
diff --git a/include/libyuv/convert_from_argb.h b/include/libyuv/convert_from_argb.h
index 8d7f02f8c4dde61f5e924e212dba9bab5fbd0d27..8bb09f6177e6a53cba831eb60a2b1bdcd11e4526 100644
--- a/include/libyuv/convert_from_argb.h
+++ b/include/libyuv/convert_from_argb.h
@@ -123,14 +123,6 @@ int ARGBToJ422(const uint8* src_argb, int src_stride_argb,
                uint8* dst_v, int dst_stride_v,
                int width, int height);
 
-// Convert ARGB To I411.
-LIBYUV_API
-int ARGBToI411(const uint8* src_argb, int src_stride_argb,
-               uint8* dst_y, int dst_stride_y,
-               uint8* dst_u, int dst_stride_u,
-               uint8* dst_v, int dst_stride_v,
-               int width, int height);
-
 // Convert ARGB to J400. (JPeg full range).
 LIBYUV_API
 int ARGBToJ400(const uint8* src_argb, int src_stride_argb,