Resident removal fix, signal config change

Use Essentials to get residents to remove (#95)
Add IHaveConfig.signalChange() method (TBMCPlugins/Chroma-Chat#117)

Chroma-Core/src/main/java/buttondevteam/core/component/towny/RemoveResidentsCommand.java

@@ -1,16 +1,23 @@
 package buttondevteam.core.component.towny;
 
+import buttondevteam.core.MainPlugin;
 import buttondevteam.lib.chat.Command2;
 import buttondevteam.lib.chat.CommandClass;
 import buttondevteam.lib.chat.CustomTabComplete;
 import buttondevteam.lib.chat.ICommand2MC;
+import buttondevteam.lib.player.TBMCPlayer;
+import com.earth2me.essentials.Essentials;
+import com.earth2me.essentials.User;
 import com.palmergames.bukkit.towny.TownySettings;
 import com.palmergames.bukkit.towny.TownyUniverse;
+import com.palmergames.bukkit.towny.object.Resident;
 import com.palmergames.bukkit.towny.object.TownyObject;
 import org.bukkit.Bukkit;
+import org.bukkit.OfflinePlayer;
 import org.bukkit.command.CommandSender;
 
 import java.util.AbstractMap;
+import java.util.Map;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
@@ -26,10 +33,17 @@ public class RemoveResidentsCommand extends ICommand2MC {
 			sender.sendMessage("Starting...");
 			var ds = TownyUniverse.getInstance().getDataSource();
 			var res = ds.getResidents().stream()
-				.flatMap(r -> Stream.of(r) //https://stackoverflow.com/questions/37299312/in-java-8-lambdas-how-to-access-original-object-in-the-stream
+				.flatMap(r -> {
-					.map(TownyObject::getName).map(Bukkit::getOfflinePlayer).filter(p -> !p.hasPlayedBefore())
+					var st = Stream.of(r) //https://stackoverflow.com/questions/37299312/in-java-8-lambdas-how-to-access-original-object-in-the-stream
-					.map(p -> new AbstractMap.SimpleEntry<>(r, p)))
+						.map(TownyObject::getName);
-				.collect(Collectors.toMap(AbstractMap.SimpleEntry::getKey, AbstractMap.SimpleEntry::getValue));
+					return (MainPlugin.ess == null
+						? st.map(Bukkit::getOfflinePlayer)
+						: st.map(MainPlugin.ess::getOfflineUser).map(User::getBase))
+						.filter(p -> !p.hasPlayedBefore())
+						.map(p -> new AbstractMap.SimpleEntry<>(r, p));
+				}).collect(Collectors.toMap(AbstractMap.SimpleEntry::getKey, AbstractMap.SimpleEntry::getValue));
+			if (MainPlugin.ess == null)
+				sender.sendMessage("§cEssentials not found, players who haven't joined after changing their names are also listed here.");
 			sender.sendMessage("Residents to remove:");
 			res.values().forEach(op -> sender.sendMessage(op.getName()));
 			if (TownySettings.isDeleteEcoAccount())

Chroma-Core/src/main/java/buttondevteam/lib/architecture/ConfigData.java

@@ -71,10 +71,7 @@ public class ConfigData<T> {
 
 	@Override
 	public String toString() {
-		return "ConfigData{" +
+		return "ConfigData{" + "path='" + path + '\'' + ", value=" + value + '}';
-			"path='" + path + '\'' +
-			", value=" + value +
-			'}';
 	}
 
 	@SuppressWarnings("unchecked")
@@ -126,6 +123,10 @@ public class ConfigData<T> {
 
 	private void setInternal(Object val) {
 		config.set(path, val);
+		signalChange(config, saveAction);
+	}
+
+	static void signalChange(ConfigurationSection config, Runnable saveAction) {
 		if (!saveTasks.containsKey(config.getRoot())) {
 			synchronized (saveTasks) {
 				saveTasks.put(config.getRoot(), new SaveTask(Bukkit.getScheduler().runTaskLaterAsynchronously(MainPlugin.Instance, () -> {

Chroma-Core/src/main/java/buttondevteam/lib/architecture/IHaveConfig.java

@@ -18,8 +18,11 @@ import java.util.stream.Collectors;
  */
 public final class IHaveConfig {
 	private final HashMap<String, ConfigData<?>> datamap = new HashMap<>();
+	/**
+	 * Returns the Bukkit ConfigurationSection. Use {@link #signalChange()} after changing it.
+	 */
 	@Getter
-	private ConfigurationSection config;
+	private final ConfigurationSection config;
 	private final Runnable saveAction;
 
 	/**
@@ -154,6 +157,13 @@ public final class IHaveConfig {
 		return (ListConfigData<T>) data;
 	}
 
+	/**
+	 * Schedules a save operation. Use after changing the ConfigurationSection directly.
+	 */
+	public void signalChange() {
+		ConfigData.signalChange(config, saveAction);
+	}
+
 	/**
 	 * Generates the config YAML.
 	 *