Switch speed 10 from 64x64 to 32x32 partitions

Results for speed 10
    PSNR |  PSNR Cb |  PSNR Cr | PSNR HVS |     SSIM |  MS SSIM | CIEDE 2000
-30.9829 | -19.2587 | -15.9204 | -18.5035 | -24.9531 | -17.7345 |   -25.8095

11% increase in execution time

src/api/config.rs

@@ -408,7 +408,7 @@ impl SpeedSettings {
     } else if speed <= 9 {
       PartitionRange::new(BlockSize::BLOCK_32X32, BlockSize::BLOCK_64X64)
     } else {
-      PartitionRange::new(BlockSize::BLOCK_64X64, BlockSize::BLOCK_64X64)
+      PartitionRange::new(BlockSize::BLOCK_32X32, BlockSize::BLOCK_32X32)
     }
   }
 

src/encoder.rs

@@ -2208,7 +2208,7 @@ fn encode_partition_bottomup<T: Pixel, W: Writer>(
   let bsh = bsize.height_mi();
   let is_square = bsize.is_sqr();
 
-  // FIXME: ask codeview what to write before assert before committing
+  // TODO: Update for 128x128 superblocks
   assert!(fi.partition_range.max <= BlockSize::BLOCK_64X64);
   // Always split if the current partition is too large, i.e. right or bottom tile border
   let must_split = (tile_bo.0.x + bsw as usize > ts.mi_width
@@ -2494,7 +2494,7 @@ fn encode_partition_topdown<T: Pixel, W: Writer>(
   let is_square = bsize.is_sqr();
   let rdo_type = RDOType::PixelDistRealRate;
 
-  // FIXME: ask codeview what to write before assert before committing
+  // TODO: Update for 128x128 superblocks
   assert!(fi.partition_range.max <= BlockSize::BLOCK_64X64);
   // Always split if the current partition is too large, i.e. right or bottom tile border
   let must_split = (tile_bo.0.x + bsw as usize > ts.mi_width