Refactor module structure #797

Job	Run time
cargo check (msrv) (android) (armv7-linux-androideabi)	32s
cargo check (msrv) (windows-latest)	13s
cargo clippy (android) (armv7-linux-androideabi)	41s
cargo check (msrv) (android) (aarch64-linux-android)	48s
cargo clippy (windows-latest)	26s
cargo check (msrv) (macos-latest)	17s
cargo clippy (android) (aarch64-linux-android)	29s
cargo check (msrv) (android) (x86_64-linux-android)	48s
cargo clippy (macos-latest)	25s
cargo check (msrv) (ubuntu-latest)	15s
cargo clippy (android) (x86_64-linux-android)	43s
cargo clippy (ubuntu-latest)	26s
cargo doc (windows-latest)	1m 13s
formatting	22s
cargo doc (macos-latest)	23s
cargo test (windows-latest)	1m 29s
typos	4s
cargo doc (ubuntu-latest)	21s
cargo test (macos-latest)	31s
cargo test (ubuntu-latest)	28s
	10m 54s

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