Refactor module structure #796

Job	Run time
cargo check (msrv) (windows-latest)	1m 6s
cargo check (msrv) (android) (armv7-linux-androideabi)	27s
cargo clippy (android) (armv7-linux-androideabi)	1m 39s
cargo check (msrv) (macos-latest)	27s
cargo clippy (windows-latest)	2m 5s
cargo check (msrv) (android) (aarch64-linux-android)	44s
cargo clippy (android) (aarch64-linux-android)	58s
cargo clippy (macos-latest)	49s
cargo check (msrv) (ubuntu-latest)	28s
cargo check (msrv) (android) (x86_64-linux-android)	47s
cargo clippy (android) (x86_64-linux-android)	1m 41s
cargo clippy (ubuntu-latest)	59s
cargo doc (windows-latest)	1m 18s
formatting	24s
cargo test (windows-latest)	1m 28s
cargo doc (macos-latest)	20s
cargo test (macos-latest)	31s
cargo doc (ubuntu-latest)	18s
typos	3s
cargo test (ubuntu-latest)	29s
	17m 1s

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