Allow destructuring in command parameters (#217) #905

Job	Run time
Clippy	53s
Test (MSRV)	5m 2s
Rustfmt	14s
Test (stable)	2m 15s
Build docs	2m 18s
Test (beta)	2m 0s
Test (nightly)	1m 57s
Test (macOS)	4m 3s
Test (Windows)	4m 7s
Test (no features)	1m 16s
Test (all features - simdjson, cargo test --all-features --lib --tests --examples)	1m 26s
Test (native TLS, cargo test --all-features --features serenity/native_tls_backend --lib --tests ...	1m 29s
	27m 0s

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