Switch to custom require function and modernise code base #163

Job	Run time
pkryger-taps (macos-latest, 29.4)	2m 56s
pkryger-taps (macos-latest, snapshot)	2m 26s
ci-tests (ubuntu-latest, 28.1)	2m 13s
ci-tests (ubuntu-latest, 28.2)	2m 11s
ci-tests (ubuntu-latest, 29.1)	1m 56s
ci-tests (ubuntu-latest, 29.2)	2m 21s
ci-tests (ubuntu-latest, 29.3)	4m 8s
ci-tests (ubuntu-latest, 29.4)	5m 29s
ci-tests (ubuntu-latest, snapshot)	3m 27s
ci-tests (macos-latest, 28.1)	3m 17s
ci-tests (macos-latest, 28.2)	3m 8s
ci-tests (macos-latest, 29.1)	2m 45s
ci-tests (macos-latest, 29.2)	4m 20s
ci-tests (macos-latest, 29.3)	2m 39s
ci-tests (macos-latest, 29.4)	6m 8s
ci-tests (macos-latest, snapshot)	4m 9s
	53m 33s

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