Move eyre code into a folder #259

Job	Run time
Check (stable)	16s
Miri	1m 27s
Rustfmt (stable)	19s
Clippy (stable)	35s
Test Suite (stable)	1m 5s
Test Suite	4m 38s
Test Suite (stable, --no-default-features)	48s
Test Suite (ubuntu-latest)	1m 0s
Test Suite (--no-default-features)	4m 31s
Test Suite (windows-latest)	1m 49s
Test Suite (stable, --features track-caller)	1m 6s
Test Suite (macOS-latest)	1m 13s
Test Suite (stable, --features pyo3)	52s
Test Suite (--features track-caller)	4m 29s
Test Suite (stable, --features auto-install)	47s
Test Suite (--features auto-install)	3m 53s
Test Suite (stable, --all-features)	50s
Test Suite (beta)	58s
Test Suite (beta, --no-default-features)	51s
Test Suite (beta, --features track-caller)	43s
Test Suite (beta, --features pyo3)	47s
Test Suite (beta, --features auto-install)	55s
Test Suite (beta, --all-features)	46s
Test Suite (nightly)	1m 1s
Test Suite (nightly, --no-default-features)	1m 5s
Test Suite (nightly, --features track-caller)	1m 7s
Test Suite (nightly, --features pyo3)	1m 0s
Test Suite (nightly, --features auto-install)	1m 3s
Test Suite (nightly, --all-features)	1m 1s
	40m 55s

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