Switch to env_home crate. Fixes #104 #177

Job	Run time
Rustfmt [Formatter]	11s
Clippy [Linter] (ubuntu-latest)	16s
Compile (x86_64-unknown-linux-musl)	9s
cargo-deny	15s
Clippy [Linter] (windows-latest)	1m 57s
Compile (wasm32-wasi)	11s
Clippy [Linter] (macos-latest)	28s
Test Suite (ubuntu-latest, 1.70)	23s
Test Suite (ubuntu-latest, stable)	17s
Test Suite (ubuntu-latest, nightly)	23s
Test Suite (windows-latest, 1.70)	1m 4s
Test Suite (windows-latest, stable)	2m 7s
Test Suite (windows-latest, nightly)	56s
Test Suite (macos-latest, 1.70)	33s
Test Suite (macos-latest, stable)	25s
Test Suite (macos-latest, nightly)	44s
	10m 19s

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