Obfuscate multiple chunks at a time over the server thread pool.
Will speed up chunk processing when anti xray is enabled.
Co-authored-by: Aikar <aikar@aikar.co>
Upon further knowledge of the system, it is known that region files
are closing properly, as well as this didn't help native memory use anyways.
This patch also caused issues compiling on a newer JDK being able to
release the jar to java 8 users.