Java Edition 1.13.2-pre1

1.13.2-pre1 is the first pre-release for 1.13.2, which includes a few performance and upgrade issue fixes that were left over from 1.13.1.

General

 * Improved performance of upgrading worlds.
 * Improved startup time.
 * Improved performance of turtle pathfinding.
 * Improved mob spawning performance.
 * Other general performance improvements.