Refactor module structure #794

Job	Run time
formatting	11s
cargo test (windows-latest)	29s
cargo check (msrv) (android) (armv7-linux-androideabi)	22s
cargo check (msrv) (windows-latest)	1m 13s
cargo test (macos-latest)	30s
cargo check (msrv) (android) (aarch64-linux-android)	48s
cargo check (msrv) (macos-latest)	36s
cargo clippy (windows-latest)	2m 6s
cargo test (ubuntu-latest)	26s
cargo check (msrv) (android) (x86_64-linux-android)	41s
cargo clippy (macos-latest)	54s
cargo check (msrv) (ubuntu-latest)	24s
cargo clippy (ubuntu-latest)	1m 12s
cargo clippy (android) (armv7-linux-androideabi)	1m 44s
cargo doc (windows-latest)	58s
typos	4s
cargo clippy (android) (aarch64-linux-android)	59s
cargo doc (macos-latest)	21s
cargo clippy (android) (x86_64-linux-android)	1m 52s
cargo doc (ubuntu-latest)	23s
	16m 13s

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