switch error handling to `thiserror` #15

Job	Run time
Check formatting (ubuntu-latest)	1m 18s
Check dependencies (ubuntu-latest)	3m 58s
Check formatting (macos-latest)	1m 32s
Check spelling	1m 17s
Check dependencies (macos-latest)	4m 47s
Check formatting (windows-latest)	1m 21s
Check dependencies (windows-latest)	4m 32s
Clippy lints (ubuntu-latest)	1m 24s
Unit tests (ubuntu-latest)	1m 23s
Clippy lints (macos-latest)	3m 31s
Unit tests (macos-latest)	4m 24s
Clippy lints (windows-latest)	3m 35s
Unit tests (windows-latest)	4m 7s
	37m 9s

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