fix #62 mobspawning in claims. add an config updater for future uses

common/src/main/java/io/github/flemmli97/flan/config/ConfigUpdater.java

@@ -0,0 +1,30 @@
+package io.github.flemmli97.flan.config;
+
+import io.github.flemmli97.flan.claim.Claim;
+
+import java.util.Map;
+
+public class ConfigUpdater {
+
+    private static final Map<Integer, Updater> updater = Config.createHashMap(map -> {
+
+    });
+
+    public static void updateConfig(int preVersion) {
+        updater.entrySet().stream().filter(e -> e.getKey() > preVersion).map(Map.Entry::getValue)
+                .forEach(Updater::configUpdater);
+    }
+
+    public static void updateClaim(Claim claim) {
+        updater.entrySet().stream().filter(e -> e.getKey() > ConfigHandler.config.preConfigVersion).map(Map.Entry::getValue)
+                .forEach(up -> up.claimUpdater(claim));
+    }
+
+    interface Updater {
+
+        void configUpdater();
+
+        void claimUpdater(Claim claim);
+
+    }
+}