* Improved encoding and decoding speed of Vec<u8>
* Added black_box calls to benches/string.rs
Added a SizeWriter because someone finally has a benchmark to show it's faster
* Improved performance for `impl<T> Encode for [T]`
* Added #[inline] to `impl Encoder for EncoderImpl`
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Co-authored-by: Victor Koenders <victor.koenders@qrtech.se>
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