Refactor: full cross-platform refactoring #214

Job	Run time
Check (windows-latest)	42s
Check (ubuntu-latest)	31s
Rustfmt	7s
Cross compile (armv7-linux-androideabi)	51s
Cross compile (x86_64-unknown-linux-musl)	46s
Cross compile (aarch64-linux-android)	49s
Cross compile (x86_64-unknown-freebsd)	44s
Check (macOS-latest)	17s
Cross compile (x86_64-unknown-netbsd)	40s
Cross compile (i686-unknown-linux-musl)	46s
	6m 13s

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