Add Brotli decoder based on the Google Brotli library.
Site docs.
<ul>
<li>Added support for writing the Snappy format</li>
<li>Added support for the LZ4 compression format</li>
+ <li>Added support for Brotli decompression</li>
</ul>
</subsection>
<subsection name="What's new in 1.13?">
