Separate java primitive arrays and implement Iterable (#1798) #492

Job	Run time
analyze_jnigen (stable)	1m 26s
build_jni_example_windows	3m 12s
build_jni_example_linux	1m 18s
analyze_jni	1m 36s
build_jni_example_android	3m 55s
run_pdfbox_example_linux	2m 26s
test_jnigen_macos_minimal	3m 5s
test_jnigen_windows_minimal	7m 25s
test_jnigen (ubuntu-latest, stable)	7m 52s
test_jnigen (ubuntu-latest, beta)	7m 50s
test_jni	1m 45s
test_jni_windows_minimal	4m 52s
test_jni_macos_minimal	1m 22s
coveralls_finish	8s
	48m 12s

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