fix(migration): Add warning message about migration

src/main/java/org/sgrewritten/stargate/Stargate.java

@@ -330,7 +330,12 @@ private void registerListeners() {
      */
     private boolean migrateConfigurationAndData() throws IOException, InvalidConfigurationException, SQLException, StargateInitializationException, URISyntaxException {
         DataMigrator dataMigrator = new DataMigrator(new File(this.getDataFolder(), StargateConstant.CONFIG_FILE), this.getDataFolder(), this.getStoredPropertiesAPI());
-
+        if (dataMigrator.getConfigVersion() <= 6) {
+            try (InputStream inputStream = Stargate.class.getResourceAsStream("/messages/migrationInit.txt")) {
+                String initMessage = FileHelper.readStreamToString(inputStream);
+                getLogger().severe(initMessage);
+            }
+        }
         if (dataMigrator.isMigrationNecessary()) {
             File debugDirectory = new File(this.getDataFolder(), "debug");
             if (!debugDirectory.isDirectory() && !debugDirectory.mkdir()) {

src/main/java/org/sgrewritten/stargate/migration/DataMigrator.java

@@ -132,4 +132,8 @@ private boolean isMigrationNecessary(DataMigration dataMigration) {
         return dataMigration.getConfigVersion() > configVersion;
     }
 
+    public int getConfigVersion(){
+        return configVersion;
+    }
+
 }

src/main/resources/messages/migrationInit.txt

@@ -0,0 +1,5 @@
+You are upgrading from a legacy version to a rewritten version.
+
+This involves upgrading your server's Stargate data to a new format.
+
+Your old data has been moved to plugins\stargate\debug\legacy.