Separate java primitive arrays and implement Iterable #490

Job	Run time
analyze_jni	1m 1s
build_jni_example_android	3m 30s
analyze_jnigen (stable)	42s
build_jni_example_linux	1m 34s
build_jni_example_windows	5m 18s
run_pdfbox_example_linux	2m 28s
test_jnigen_macos_minimal	2m 44s
test_jnigen_windows_minimal	6m 40s
test_jnigen (ubuntu-latest, stable)	7m 26s
test_jnigen (ubuntu-latest, beta)	7m 29s
test_jni	1m 50s
test_jni_macos_minimal	1m 23s
test_jni_windows_minimal	3m 18s
coveralls_finish	3s
	45m 26s

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