VSand v1.2.4

This minor version focus on technical improvements, under the hood:

• Review of the building process to keep the different modules of the game in different pieces. This allow to take benefit of the patch system of Itch.io. In other words: when you'll update the game using the Itch Application, only the modified modules will be downloaded.
• Update of the embedded JRE: v11.0.4+11-Openj9-0.15.1.
• VSand now runs with -Xshareclasses option (from Openj9), allowing faster game start.
• Faster RNG: ThreadLocalRandom.