Refactor type #354

Job	Run time
analyze_jnigen (stable)	46s
build_jni_example_linux	1m 4s
analyze_jni	52s
build_jni_example_android	3m 28s
build_jni_example_windows	5m 30s
run_pdfbox_example_linux	2m 44s
test_jnigen_windows_minimal	6m 50s
test_jnigen_macos_minimal	3m 3s
test_jnigen (ubuntu-latest, stable)	7m 54s
test_jnigen (ubuntu-latest, beta)	7m 22s
test_jni_windows_minimal	4m 40s
test_jni	1m 45s
test_jni_macos_minimal	1m 18s
coveralls_finish	5s
	47m 21s

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