Refactor module structure #795

Job	Run time
cargo clippy (windows-latest)	1m 38s
cargo check (msrv) (windows-latest)	1m 5s
cargo check (msrv) (android) (armv7-linux-androideabi)	22s
cargo clippy (macos-latest)	1m 1s
cargo check (msrv) (macos-latest)	28s
cargo clippy (android) (armv7-linux-androideabi)	1m 49s
cargo check (msrv) (android) (aarch64-linux-android)	50s
cargo clippy (ubuntu-latest)	1m 4s
cargo check (msrv) (ubuntu-latest)	22s
cargo clippy (android) (aarch64-linux-android)	56s
cargo check (msrv) (android) (x86_64-linux-android)	47s
cargo clippy (android) (x86_64-linux-android)	1m 48s
cargo doc (windows-latest)	50s
formatting	22s
cargo doc (macos-latest)	22s
cargo test (windows-latest)	1m 18s
cargo test (macos-latest)	35s
typos	4s
cargo doc (ubuntu-latest)	17s
cargo test (ubuntu-latest)	30s
	16m 28s

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