nostd-printf vs brotli vs printf-compat

Rust crate containing an embedded version of printf which can be used in `no_std` projects which aren't linked to `libc`.

A brotli compressor and decompressor that 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.

printf reimplemented in Rust