Get rid of autoref-specialisation #1158

Job	Run time
Build docs	1m 19s
Test (MSRV)	1m 21s
Rustfmt	12s
Test (stable)	1m 52s
Clippy	47s
Test (beta)	1m 56s
Test (nightly)	1m 47s
Test (macOS)	1m 19s
Test (Windows)	4m 49s
Test (no features)	1m 11s
Test (all features - simdjson, cargo test --all-features --lib --tests --examples)	1m 19s
Test (native TLS, cargo test --all-features --features serenity/native_tls_backend --lib --tests ...	1m 22s
	19m 14s

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