Refactor module structure #803

Job	Run time
cargo clippy (windows-latest)	2m 3s
cargo clippy (android) (armv7-linux-androideabi)	1m 42s
cargo clippy (macos-latest)	51s
cargo clippy (android) (aarch64-linux-android)	1m 0s
cargo check (msrv) (android) (armv7-linux-androideabi)	27s
cargo clippy (ubuntu-latest)	59s
cargo doc (windows-latest)	1m 17s
cargo clippy (android) (x86_64-linux-android)	1m 39s
cargo check (msrv) (android) (aarch64-linux-android)	48s
cargo doc (macos-latest)	20s
cargo check (msrv) (android) (x86_64-linux-android)	44s
cargo doc (ubuntu-latest)	18s
formatting	25s
cargo test (windows-latest)	1m 12s
cargo test (macos-latest)	32s
typos	4s
cargo check (msrv) (windows-latest)	1m 4s
cargo test (ubuntu-latest)	29s
cargo check (msrv) (macos-latest)	27s
cargo check (msrv) (ubuntu-latest)	27s
	16m 48s

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