Revert "Delete integers resource file"

This reverts commit 38f1635b93eb72b98512e93c058d35cb743f98c0.
Revert "Use val"

This reverts commit 6f4a3046440170239ac37a31ce69110db61ec642.
Revert "Use Java 8 and retrolambda"

This reverts commit 2354d0b604fdcf64ca0c3688f57aaf8ab78a2b06.
Delete lombok
Update sdk version
Introduce grooid