Compressor and decompressor for brotli written in rust

 A compressor and decompressor for brotli with an interface avoiding the rust
 stdlib.
 This makes it suitable for embedded devices and kernels.
 It is designed with a pluggable allocator so that the standard lib's allocator
 may be employed.
 The default build also includes a stdlib allocator and stream interface.
 Disable this with --features=no-stdlib. All included code is safe.