Refactor: full cross-platform refactoring #211

Job	Run time
Check (macOS-latest)	20s
Check (ubuntu-latest)	20s
Rustfmt	11s
Cross compile (x86_64-unknown-netbsd)	44s
Cross compile (aarch64-linux-android)	1m 13s
Check (windows-latest)	49s
Cross compile (x86_64-unknown-linux-musl)	45s
Cross compile (armv7-linux-androideabi)	59s
Cross compile (i686-unknown-linux-musl)	52s
Cross compile (x86_64-unknown-freebsd)	41s
	6m 54s

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