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.

Changes

 * Improved performance of upgrading worlds
 * Improved startup time
 * Improved performance of turtle pathfinding
 * Improved mob spawning performance
 * General other performance improvements