Begin milestone 3 age persistence

gradle.properties

@@ -32,8 +32,8 @@ mod_id=rivencraft
 mod_name=Rivencraft
 # The license of the mod. Review your options at https://choosealicense.com/. All Rights Reserved is the default.
 mod_license=LGPL-3.0-or-later
-# The mod version. See https://semver.org/
-mod_version=0.2.8
+# The mod version. Rivencraft uses the x.y.z.b policy documented in README.md.
+mod_version=0.2.9.0
 # The group ID for the mod. It is only important when publishing as an artifact to a Maven repository.
 # This should match the base package used for the mod sources.
 # See https://maven.apache.org/guides/mini/guide-naming-conventions.html