fix: Address warnings throughout all crates, examples #812

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Job	Run time
nix-fmt-check	32s
nix-flake-check (ubuntu-latest)	32s
cargo (cargo fmt --verbose --all -- --check)	1m 3s
nix-flake-check (macos-latest)	1m 30s
cargo (cargo check --locked --workspace)	4m 36s
cargo (cargo check --locked --examples --workspace)	3m 49s
cargo (cargo doc --locked --workspace --features "egui")	9m 4s
cargo (cargo test --locked -p nannou_core --no-default-features --features "libm serde")	1m 10s
cargo (mdbook build guide/)	1m 2s
cargo (cargo test --locked -p book_tests)	7m 6s
verifications	0s
guide-push-to-deploy	0s
cargo-publish	0s
	30m 24s

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