Refactor: full cross-platform refactoring #215

Job	Run time
Check (ubuntu-latest)	19s
Check (windows-latest)	50s
Check (macOS-latest)	18s
Rustfmt	7s
Cross compile (x86_64-unknown-linux-musl)	51s
Cross compile (i686-unknown-linux-musl)	41s
Cross compile (armv7-linux-androideabi)	46s
Cross compile (x86_64-unknown-netbsd)	46s
Cross compile (x86_64-unknown-freebsd)	31s
Cross compile (aarch64-linux-android)	52s
	6m 1s

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